20375621 has 12 divisors (see below), whose sum is σ = 23775840. Its totient is φ = 17410680.

The previous prime is 20375573. The next prime is 20375627. The reversal of 20375621 is 12657302.

It is not a de Polignac number, because 20375621 - 2¹⁴ = 20359237 is a prime.

It is a super-2 number, since 2×20375621² = 830331862271282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20375627) 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, 30590 + ... + 31248.

It is an arithmetic number, because the mean of its divisors is an integer number (1981320).

Almost surely, 2^20375621 is an apocalyptic number.

It is an amenable number.

20375621 is a deficient number, since it is larger than the sum of its proper divisors (3400219).

20375621 is an equidigital number, since it uses as much as digits as its factorization.

20375621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20375621 is about 4513.9363088107. The cubic root of 20375621 is about 273.1305533801.

The spelling of 20375621 in words is "twenty million, three hundred seventy-five thousand, six hundred twenty-one".