20439528 has 16 divisors (see below), whose sum is σ = 51098880. Its totient is φ = 6813168.

The previous prime is 20439493. The next prime is 20439541. The reversal of 20439528 is 82593402.

It is a happy 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, 425800 + ... + 425847.

It is an arithmetic number, because the mean of its divisors is an integer number (3193680).

Almost surely, 2^20439528 is an apocalyptic number.

It is an amenable number.

20439528 is an abundant number, since it is smaller than the sum of its proper divisors (30659352).

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

20439528 is a wasteful number, since it uses less digits than its factorization.

20439528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851656 (or 851652 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 20439528 is about 4521.0096217549. The cubic root of 20439528 is about 273.4158082798.

The spelling of 20439528 in words is "twenty million, four hundred thirty-nine thousand, five hundred twenty-eight".