20475621 has 12 divisors (see below), whose sum is σ = 29641248. Its totient is φ = 13620264.

The previous prime is 20475613. The next prime is 20475641. The reversal of 20475621 is 12657402.

It is not a de Polignac number, because 20475621 - 2³ = 20475613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475641) 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, 2266 + ... + 6788.

It is an arithmetic number, because the mean of its divisors is an integer number (2470104).

Almost surely, 2^20475621 is an apocalyptic number.

It is an amenable number.

20475621 is a deficient number, since it is larger than the sum of its proper divisors (9165627).

20475621 is a wasteful number, since it uses less digits than its factorization.

20475621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5032 (or 5029 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20475621 is about 4524.9995580110. Note that the first 3 decimals coincide. The cubic root of 20475621 is about 273.5766501182.

The spelling of 20475621 in words is "twenty million, four hundred seventy-five thousand, six hundred twenty-one".