20524820 has 24 divisors (see below), whose sum is σ = 43196328. Its totient is φ = 8192000.

The previous prime is 20524813. The next prime is 20524849. The reversal of 20524820 is 2842502.

It can be written as a sum of positive squares in 4 ways, for example, as 13060996 + 7463824 = 3614^2 + 2732^2 .

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, 12020 + ... + 13620.

It is an arithmetic number, because the mean of its divisors is an integer number (1799847).

Almost surely, 2^20524820 is an apocalyptic number.

20524820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20524820 is an abundant number, since it is smaller than the sum of its proper divisors (22671508).

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

20524820 is a wasteful number, since it uses less digits than its factorization.

20524820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2251 (or 2249 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20524820 is about 4530.4326504209. The cubic root of 20524820 is about 273.7955923034.

The spelling of 20524820 in words is "twenty million, five hundred twenty-four thousand, eight hundred twenty".