20870528 has 32 divisors (see below), whose sum is σ = 47519760. Its totient is φ = 8944128.

The previous prime is 20870513. The next prime is 20870573. The reversal of 20870528 is 82507802.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 20870494 and 20870503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10751 + ... + 12542.

Almost surely, 2^20870528 is an apocalyptic number.

20870528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20870528 is an abundant number, since it is smaller than the sum of its proper divisors (26649232).

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

20870528 is an equidigital number, since it uses as much as digits as its factorization.

20870528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23314 (or 23302 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 20870528 is about 4568.4273005051. The cubic root of 20870528 is about 275.3242588310.

The spelling of 20870528 in words is "twenty million, eight hundred seventy thousand, five hundred twenty-eight".