20528424 has 64 divisors (see below), whose sum is σ = 65174400. Its totient is φ = 5864832.

The previous prime is 20528423. The next prime is 20528429. The reversal of 20528424 is 42482502.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20528423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5277 + ... + 8300.

It is an arithmetic number, because the mean of its divisors is an integer number (1018350).

Almost surely, 2^20528424 is an apocalyptic number.

20528424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20528424 is an abundant number, since it is smaller than the sum of its proper divisors (44645976).

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

20528424 is a wasteful number, since it uses less digits than its factorization.

20528424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13599 (or 13589 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 20528424 is about 4530.8303874676. The cubic root of 20528424 is about 273.8116168299.

The spelling of 20528424 in words is "twenty million, five hundred twenty-eight thousand, four hundred twenty-four".