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20001031220 = 2251000051561
BaseRepresentation
bin10010101000001001…
…111000010000110100
31220121220110122211002
4102220021320100310
5311430230444340
613104403302432
71305433650242
oct225011702064
956556418732
1020001031220
118534073875
123a6237aa18
131b69979121
14d7a4b3792
157c0dc1715
hex4a8278434

20001031220 has 12 divisors (see below), whose sum is σ = 42002165604. Its totient is φ = 8000412480.

The previous prime is 20001031213. The next prime is 20001031249. The reversal of 20001031220 is 2213010002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9276771856 + 10724259364 = 96316^2 + 103558^2 .

It is a congruent number.

It is an unprimeable number.

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, 500025761 + ... + 500025800.

It is an arithmetic number, because the mean of its divisors is an integer number (3500180467).

Almost surely, 220001031220 is an apocalyptic number.

20001031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001031220 is an abundant number, since it is smaller than the sum of its proper divisors (22001134384).

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

20001031220 is a wasteful number, since it uses less digits than its factorization.

20001031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000051570 (or 1000051568 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20001031220 its reverse (2213010002), we get a palindrome (22214041222).

The spelling of 20001031220 in words is "twenty billion, one million, thirty-one thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 1000051561 2000103122 4000206244 5000257805 10000515610 20001031220