20700644 has 24 divisors (see below), whose sum is σ = 38008320. Its totient is φ = 9846144.

The previous prime is 20700643. The next prime is 20700677. The reversal of 20700644 is 44600702.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (20700643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20012 + ... + 21020.

It is an arithmetic number, because the mean of its divisors is an integer number (1583680).

Almost surely, 2^20700644 is an apocalyptic number.

It is an amenable number.

20700644 is a deficient number, since it is larger than the sum of its proper divisors (17307676).

20700644 is a wasteful number, since it uses less digits than its factorization.

20700644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1259 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 20700644 is about 4549.7960393846. The cubic root of 20700644 is about 274.5751854150.

The spelling of 20700644 in words is "twenty million, seven hundred thousand, six hundred forty-four".