20492975 has 6 divisors (see below), whose sum is σ = 25411320. Its totient is φ = 16394360.

The previous prime is 20492971. The next prime is 20492999. The reversal of 20492975 is 57929402.

It is not a de Polignac number, because 20492975 - 2² = 20492971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20492971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409835 + ... + 409884.

It is an arithmetic number, because the mean of its divisors is an integer number (4235220).

Almost surely, 2^20492975 is an apocalyptic number.

20492975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20492975 is a deficient number, since it is larger than the sum of its proper divisors (4918345).

20492975 is an equidigital number, since it uses as much as digits as its factorization.

20492975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819729 (or 819724 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 20492975 is about 4526.9167211249. The cubic root of 20492975 is about 273.6539177549.

The spelling of 20492975 in words is "twenty million, four hundred ninety-two thousand, nine hundred seventy-five".