20628724 has 12 divisors (see below), whose sum is σ = 36164548. Its totient is φ = 10296000.

The previous prime is 20628709. The next prime is 20628731. The reversal of 20628724 is 42782602.

It can be written as a sum of positive squares in 2 ways, for example, as 6340324 + 14288400 = 2518^2 + 3780^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887 + ... + 6694.

Almost surely, 2^20628724 is an apocalyptic number.

It is an amenable number.

20628724 is a deficient number, since it is larger than the sum of its proper divisors (15535824).

20628724 is a wasteful number, since it uses less digits than its factorization.

20628724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186 (or 9184 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20628724 is about 4541.8855115469. The cubic root of 20628724 is about 274.2568320179.

The spelling of 20628724 in words is "twenty million, six hundred twenty-eight thousand, seven hundred twenty-four".