20313639 has 16 divisors (see below), whose sum is σ = 30232800. Its totient is φ = 13480128.

The previous prime is 20313619. The next prime is 20313647. The reversal of 20313639 is 93631302.

20313639 is a `hidden beast` number, since 20 + 3 + 1 + 3 + 639 = 666.

It is not a de Polignac number, because 20313639 - 2⁵ = 20313607 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4677 + ... + 7905.

It is an arithmetic number, because the mean of its divisors is an integer number (1889550).

Almost surely, 2^20313639 is an apocalyptic number.

20313639 is a deficient number, since it is larger than the sum of its proper divisors (9919161).

20313639 is a wasteful number, since it uses less digits than its factorization.

20313639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471 (or 3465 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 20313639 is about 4507.0654532634. The cubic root of 20313639 is about 272.8533205530.

The spelling of 20313639 in words is "twenty million, three hundred thirteen thousand, six hundred thirty-nine".