20644713 has 10 divisors (see below), whose sum is σ = 30839754. Its totient is φ = 13763088.

The previous prime is 20644699. The next prime is 20644727. The reversal of 20644713 is 31744602.

20644713 is a `hidden beast` number, since 2 + 0 + 644 + 7 + 13 = 666.

It is an interprime number because it is at equal distance from previous prime (20644699) and next prime (20644727).

It can be written as a sum of positive squares in only one way, i.e., 12194064 + 8450649 = 3492^2 + 2907^2 .

It is not a de Polignac number, because 20644713 - 2⁶ = 20644649 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20644733) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 127356 + ... + 127517.

Almost surely, 2^20644713 is an apocalyptic number.

It is an amenable number.

20644713 is a deficient number, since it is larger than the sum of its proper divisors (10195041).

20644713 is an equidigital number, since it uses as much as digits as its factorization.

20644713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254885 (or 254876 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20644713 is about 4543.6453426737. The cubic root of 20644713 is about 274.3276711068.

The spelling of 20644713 in words is "twenty million, six hundred forty-four thousand, seven hundred thirteen".