20497275 has 18 divisors (see below), whose sum is σ = 36713300. Its totient is φ = 10931760.

The previous prime is 20497271. The next prime is 20497277. The reversal of 20497275 is 57279402.

It is not a de Polignac number, because 20497275 - 2² = 20497271 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20497271) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45325 + ... + 45774.

Almost surely, 2^20497275 is an apocalyptic number.

20497275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20497275 is a deficient number, since it is larger than the sum of its proper divisors (16216025).

20497275 is a wasteful number, since it uses less digits than its factorization.

20497275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91115 (or 91107 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20497275 is about 4527.3916331592. The cubic root of 20497275 is about 273.6730565013.

It can be divided in two parts, 204 and 97275, that added together give a palindrome (97479).

The spelling of 20497275 in words is "twenty million, four hundred ninety-seven thousand, two hundred seventy-five".