20197215870 has 64 divisors (see below), whose sum is σ = 52917205824. Its totient is φ = 4903511040.

The previous prime is 20197215847. The next prime is 20197215893. The reversal of 20197215870 is 7851279102.

It is an interprime number because it is at equal distance from previous prime (20197215847) and next prime (20197215893).

It is a congruent number.

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, 326241 + ... + 383180.

It is an arithmetic number, because the mean of its divisors is an integer number (826831341).

Almost surely, 2^20197215870 is an apocalyptic number.

20197215870 is an abundant number, since it is smaller than the sum of its proper divisors (32719989954).

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

20197215870 is a wasteful number, since it uses less digits than its factorization.

20197215870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709517.

The product of its (nonzero) digits is 70560, while the sum is 42.

The spelling of 20197215870 in words is "twenty billion, one hundred ninety-seven million, two hundred fifteen thousand, eight hundred seventy".