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1211180020 = 22560559001
BaseRepresentation
bin100100000110001…
…0010001111110100
310010102001022122021
41020030102033310
54440030230040
6320103442524
742004601041
oct11014221764
93112038567
101211180020
11571752526
12299756444
13163c0a18b
14b6c001c8
15714e824a
hex483123f4

1211180020 has 12 divisors (see below), whose sum is σ = 2543478084. Its totient is φ = 484472000.

The previous prime is 1211180017. The next prime is 1211180027. The reversal of 1211180020 is 200811121.

It can be written as a sum of positive squares in 2 ways, for example, as 184362084 + 1026817936 = 13578^2 + 32044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211179976 and 1211180003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211180027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30279481 + ... + 30279520.

It is an arithmetic number, because the mean of its divisors is an integer number (211956507).

Almost surely, 21211180020 is an apocalyptic number.

1211180020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211180020 is an abundant number, since it is smaller than the sum of its proper divisors (1332298064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211180020 is a wasteful number, since it uses less digits than its factorization.

1211180020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60559010 (or 60559008 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 1211180020 is about 34802.0117234622. The cubic root of 1211180020 is about 1065.9485242084.

Adding to 1211180020 its reverse (200811121), we get a palindrome (1411991141).

The spelling of 1211180020 in words is "one billion, two hundred eleven million, one hundred eighty thousand, twenty".

Divisors: 1 2 4 5 10 20 60559001 121118002 242236004 302795005 605590010 1211180020