20157697040 has 160 divisors (see below), whose sum is σ = 51109228800. Its totient is φ = 7349557248.

The previous prime is 20157697019. The next prime is 20157697061. The reversal of 20157697040 is 4079675102.

It is an interprime number because it is at equal distance from previous prime (20157697019) and next prime (20157697061).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35803799 + ... + 35804361.

It is an arithmetic number, because the mean of its divisors is an integer number (319432680).

Almost surely, 2^20157697040 is an apocalyptic number.

20157697040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20157697040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25554614400).

20157697040 is an abundant number, since it is smaller than the sum of its proper divisors (30951531760).

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

20157697040 is a wasteful number, since it uses less digits than its factorization.

20157697040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 20157697040 in words is "twenty billion, one hundred fifty-seven million, six hundred ninety-seven thousand, forty".