20397897120 has 96 divisors (see below), whose sum is σ = 64722587328. Its totient is φ = 5399717888.

The previous prime is 20397897109. The next prime is 20397897131. The reversal of 20397897120 is 2179879302.

It is an interprime number because it is at equal distance from previous prime (20397897109) and next prime (20397897131).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20397897120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89334 + ... + 220853.

It is an arithmetic number, because the mean of its divisors is an integer number (674193618).

Almost surely, 2^20397897120 is an apocalyptic number.

20397897120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20397897120 is an abundant number, since it is smaller than the sum of its proper divisors (44324690208).

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

20397897120 is a wasteful number, since it uses less digits than its factorization.

20397897120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310342 (or 310334 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The spelling of 20397897120 in words is "twenty billion, three hundred ninety-seven million, eight hundred ninety-seven thousand, one hundred twenty".