20655124900 has 18 divisors (see below), whose sum is σ = 44821621250. Its totient is φ = 8262049920.

The previous prime is 20655124871. The next prime is 20655124909. The reversal of 20655124900 is 942155602.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1394126244 + 19260998656 = 37338^2 + 138784^2 .

It is not an unprimeable number, because it can be changed into a prime (20655124909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103275525 + ... + 103275724.

Almost surely, 2^20655124900 is an apocalyptic number.

20655124900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20655124900 is an abundant number, since it is smaller than the sum of its proper divisors (24166496350).

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

20655124900 is a wasteful number, since it uses less digits than its factorization.

20655124900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206551263 (or 206551256 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 20655124900 in words is "twenty billion, six hundred fifty-five million, one hundred twenty-four thousand, nine hundred".