20557829601 has 12 divisors (see below), whose sum is σ = 29701975680. Its totient is φ = 13701835320.

The previous prime is 20557829597. The next prime is 20557829603. The reversal of 20557829601 is 10692875502.

20557829601 is a `hidden beast` number, since 2 + 0 + 557 + 8 + 2 + 96 + 0 + 1 = 666.

It is not a de Polignac number, because 20557829601 - 2² = 20557829597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20557829603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243285 + ... + 316706.

It is an arithmetic number, because the mean of its divisors is an integer number (2475164640).

Almost surely, 2^20557829601 is an apocalyptic number.

It is an amenable number.

20557829601 is a deficient number, since it is larger than the sum of its proper divisors (9144146079).

20557829601 is a wasteful number, since it uses less digits than its factorization.

20557829601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564076 (or 564073 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 20557829601 in words is "twenty billion, five hundred fifty-seven million, eight hundred twenty-nine thousand, six hundred one".