20454975 has 18 divisors (see below), whose sum is σ = 36637536. Its totient is φ = 10909200.

The previous prime is 20454953. The next prime is 20454977. The reversal of 20454975 is 57945402.

It is not a de Polignac number, because 20454975 - 2⁵ = 20454943 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20454977) 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, 45231 + ... + 45680.

Almost surely, 2^20454975 is an apocalyptic number.

20454975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20454975 is a deficient number, since it is larger than the sum of its proper divisors (16182561).

20454975 is a wasteful number, since it uses less digits than its factorization.

20454975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90927 (or 90919 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 20454975 is about 4522.7176564539. The cubic root of 20454975 is about 273.4846681623.

The spelling of 20454975 in words is "twenty million, four hundred fifty-four thousand, nine hundred seventy-five".