20197815297 has 32 divisors (see below), whose sum is σ = 30121058304. Its totient is φ = 11933798400.

The previous prime is 20197815259. The next prime is 20197815301. The reversal of 20197815297 is 79251879102.

It is not a de Polignac number, because 20197815297 - 2²³ = 20189426689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20197815097) 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, 373272 + ... + 423942.

It is an arithmetic number, because the mean of its divisors is an integer number (941283072).

Almost surely, 2^20197815297 is an apocalyptic number.

It is an amenable number.

20197815297 is a deficient number, since it is larger than the sum of its proper divisors (9923243007).

20197815297 is a wasteful number, since it uses less digits than its factorization.

20197815297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50989.

The product of its (nonzero) digits is 635040, while the sum is 51.

It can be divided in two parts, 2019781 and 5297, that added together give a triangular number (2025078 = T₂₀₁₂).

The spelling of 20197815297 in words is "twenty billion, one hundred ninety-seven million, eight hundred fifteen thousand, two hundred ninety-seven".