20624020 has 24 divisors (see below), whose sum is σ = 43460424. Its totient is φ = 8221056.

The previous prime is 20624003. The next prime is 20624041. The reversal of 20624020 is 2042602.

It can be written as a sum of positive squares in 4 ways, for example, as 3218436 + 17405584 = 1794^2 + 4172^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20623985 and 20624003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4714 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (1810851).

Almost surely, 2^20624020 is an apocalyptic number.

20624020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20624020 is an abundant number, since it is smaller than the sum of its proper divisors (22836404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20624020 is a wasteful number, since it uses less digits than its factorization.

20624020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579 (or 3577 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20624020 is about 4541.3676354156. The cubic root of 20624020 is about 274.2359840293.

Adding to 20624020 its reverse (2042602), we get a palindrome (22666622).

The spelling of 20624020 in words is "twenty million, six hundred twenty-four thousand, twenty".