20509892 has 24 divisors (see below), whose sum is σ = 40689600. Its totient is φ = 8967456.

The previous prime is 20509891. The next prime is 20509903. The reversal of 20509892 is 29890502.

It is not an unprimeable number, because it can be changed into a prime (20509891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9392 + ... + 11367.

It is an arithmetic number, because the mean of its divisors is an integer number (1695400).

Almost surely, 2^20509892 is an apocalyptic number.

It is an amenable number.

20509892 is a deficient number, since it is larger than the sum of its proper divisors (20179708).

20509892 is a wasteful number, since it uses less digits than its factorization.

20509892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20795 (or 20793 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 20509892 is about 4528.7848259771. The cubic root of 20509892 is about 273.7291976992.

The spelling of 20509892 in words is "twenty million, five hundred nine thousand, eight hundred ninety-two".