20290975 has 12 divisors (see below), whose sum is σ = 25229536. Its totient is φ = 16188480.

The previous prime is 20290973. The next prime is 20290999. The reversal of 20290975 is 57909202.

It is not a de Polignac number, because 20290975 - 2¹ = 20290973 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20290975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10699 + ... + 12451.

Almost surely, 2^20290975 is an apocalyptic number.

20290975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20290975 is a deficient number, since it is larger than the sum of its proper divisors (4938561).

20290975 is a wasteful number, since it uses less digits than its factorization.

20290975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20290975 is about 4504.5504770177. The cubic root of 20290975 is about 272.7518083145.

The spelling of 20290975 in words is "twenty million, two hundred ninety thousand, nine hundred seventy-five".