20534720 has 28 divisors (see below), whose sum is σ = 48899064. Its totient is φ = 8213760.

The previous prime is 20534719. The next prime is 20534729. The reversal of 20534720 is 2743502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20534729) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 31766 + ... + 32405.

Almost surely, 2^20534720 is an apocalyptic number.

20534720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20534720 is an abundant number, since it is smaller than the sum of its proper divisors (28364344).

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

20534720 is an equidigital number, since it uses as much as digits as its factorization.

20534720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64188 (or 64178 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 20534720 is about 4531.5251295783. The cubic root of 20534720 is about 273.8396063422.

The spelling of 20534720 in words is "twenty million, five hundred thirty-four thousand, seven hundred twenty".