20700724 has 12 divisors (see below), whose sum is σ = 39519648. Its totient is φ = 9409400.

The previous prime is 20700697. The next prime is 20700733. The reversal of 20700724 is 42700702.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20700695 and 20700704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235192 + ... + 235279.

It is an arithmetic number, because the mean of its divisors is an integer number (3293304).

Almost surely, 2^20700724 is an apocalyptic number.

It is an amenable number.

20700724 is a deficient number, since it is larger than the sum of its proper divisors (18818924).

20700724 is a wasteful number, since it uses less digits than its factorization.

20700724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470486 (or 470484 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 20700724 is about 4549.8048309790. The cubic root of 20700724 is about 274.5755391236.

Subtracting from 20700724 its sum of digits (22), we obtain a palindrome (20700702).

The spelling of 20700724 in words is "twenty million, seven hundred thousand, seven hundred twenty-four".