20504031657 has 8 divisors (see below), whose sum is σ = 27374636640. Its totient is φ = 13651390560.

The previous prime is 20504031631. The next prime is 20504031673. The reversal of 20504031657 is 75613040502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20504031657 - 2¹² = 20504027561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20504032657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4488307 + ... + 4492872.

It is an arithmetic number, because the mean of its divisors is an integer number (3421829580).

Almost surely, 2^20504031657 is an apocalyptic number.

It is an amenable number.

20504031657 is a deficient number, since it is larger than the sum of its proper divisors (6870604983).

20504031657 is an equidigital number, since it uses as much as digits as its factorization.

20504031657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8981943.

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 20504031657 in words is "twenty billion, five hundred four million, thirty-one thousand, six hundred fifty-seven".