20632820 has 24 divisors (see below), whose sum is σ = 46662504. Its totient is φ = 7618176.

The previous prime is 20632811. The next prime is 20632853. The reversal of 20632820 is 2823602.

It can be written as a sum of positive squares in 4 ways, for example, as 364816 + 20268004 = 604^2 + 4502^2 .

It is a super-2 number, since 2×20632820² = 851426522304800, which contains 22 as substring.

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, 39419 + ... + 39938.

It is an arithmetic number, because the mean of its divisors is an integer number (1944271).

Almost surely, 2^20632820 is an apocalyptic number.

20632820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20632820 is an abundant number, since it is smaller than the sum of its proper divisors (26029684).

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

20632820 is a wasteful number, since it uses less digits than its factorization.

20632820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79379 (or 79377 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20632820 is about 4542.3364032181. The cubic root of 20632820 is about 274.2749827874.

The spelling of 20632820 in words is "twenty million, six hundred thirty-two thousand, eight hundred twenty".