20857190790 has 16 divisors (see below), whose sum is σ = 50057257968. Its totient is φ = 5561917536.

The previous prime is 20857190789. The next prime is 20857190797. The reversal of 20857190790 is 9709175802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857190797) 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, 347619817 + ... + 347619876.

It is an arithmetic number, because the mean of its divisors is an integer number (3128578623).

Almost surely, 2^20857190790 is an apocalyptic number.

20857190790 is an abundant number, since it is smaller than the sum of its proper divisors (29200067178).

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

20857190790 is a wasteful number, since it uses less digits than its factorization.

20857190790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695239703.

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 20857190790 in words is "twenty billion, eight hundred fifty-seven million, one hundred ninety thousand, seven hundred ninety".