20639601 has 12 divisors (see below), whose sum is σ = 29852160. Its totient is φ = 13741560.

The previous prime is 20639587. The next prime is 20639623. The reversal of 20639601 is 10693602.

It is a happy number.

20639601 is a `hidden beast` number, since 20 + 6 + 39 + 601 = 666.

It is not a de Polignac number, because 20639601 - 2⁵ = 20639569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20639401) 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, 12460 + ... + 14018.

It is an arithmetic number, because the mean of its divisors is an integer number (2487680).

Almost surely, 2^20639601 is an apocalyptic number.

It is an amenable number.

20639601 is a deficient number, since it is larger than the sum of its proper divisors (9212559).

20639601 is a wasteful number, since it uses less digits than its factorization.

20639601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036 (or 3033 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20639601 is about 4543.0827639390. The cubic root of 20639601 is about 274.3050264258.

It can be divided in two parts, 2063 and 9601, that added together give a square (11664 = 108²).

The spelling of 20639601 in words is "twenty million, six hundred thirty-nine thousand, six hundred one".