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100020020 = 2255001001
BaseRepresentation
bin1011111011000…
…10111100110100
320222012112200012
411331202330310
5201101120040
613531435352
72323104362
oct575427464
9228175605
10100020020
1151505581
12295b5b58
131794c959
14d3d8632
158baa865
hex5f62f34

100020020 has 12 divisors (see below), whose sum is σ = 210042084. Its totient is φ = 40008000.

The previous prime is 100019977. The next prime is 100020023. The reversal of 100020020 is 20020001.

It can be written as a sum of positive squares in 2 ways, for example, as 77228944 + 22791076 = 8788^2 + 4774^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

100020020 is a modest number, since divided by 20020 gives 100 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 100019986 and 100020013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100020023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500481 + ... + 2500520.

It is an arithmetic number, because the mean of its divisors is an integer number (17503507).

Almost surely, 2100020020 is an apocalyptic number.

100020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100020020 is an abundant number, since it is smaller than the sum of its proper divisors (110022064).

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

100020020 is a wasteful number, since it uses less digits than its factorization.

100020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001010 (or 5001008 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

The square root of 100020020 is about 10001.0009499050. Note that the first 3 decimals coincide. The cubic root of 100020020 is about 464.1898561639.

Adding to 100020020 its reverse (20020001), we get a palindrome (120040021).

The spelling of 100020020 in words is "one hundred million, twenty thousand, twenty".

Divisors: 1 2 4 5 10 20 5001001 10002002 20004004 25005005 50010010 100020020