20158731670 has 64 divisors (see below), whose sum is σ = 45268761600. Its totient is φ = 6279154560.

The previous prime is 20158731653. The next prime is 20158731673. The reversal of 20158731670 is 7613785102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158731673) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1308271 + ... + 1323589.

It is an arithmetic number, because the mean of its divisors is an integer number (707324400).

Almost surely, 2^20158731670 is an apocalyptic number.

20158731670 is an abundant number, since it is smaller than the sum of its proper divisors (25110029930).

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

20158731670 is a wasteful number, since it uses less digits than its factorization.

20158731670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17053.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 20158731670 in words is "twenty billion, one hundred fifty-eight million, seven hundred thirty-one thousand, six hundred seventy".