20534820 has 48 divisors (see below), whose sum is σ = 60527040. Its totient is φ = 5187456.

The previous prime is 20534819. The next prime is 20534831. The reversal of 20534820 is 2843502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7867 + ... + 10146.

It is an arithmetic number, because the mean of its divisors is an integer number (1260980).

Almost surely, 2^20534820 is an apocalyptic number.

20534820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20534820 is an abundant number, since it is smaller than the sum of its proper divisors (39992220).

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

20534820 is a wasteful number, since it uses less digits than its factorization.

20534820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044 (or 18042 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 20534820 is about 4531.5361633777. The cubic root of 20534820 is about 273.8400508563.

The spelling of 20534820 in words is "twenty million, five hundred thirty-four thousand, eight hundred twenty".