20509692 has 48 divisors (see below), whose sum is σ = 56179200. Its totient is φ = 5700672.

The previous prime is 20509679. The next prime is 20509733. The reversal of 20509692 is 29690502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192 + ... + 6407.

It is an arithmetic number, because the mean of its divisors is an integer number (1170400).

Almost surely, 2^20509692 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20509692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28089600).

20509692 is an abundant number, since it is smaller than the sum of its proper divisors (35669508).

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

20509692 is a wasteful number, since it uses less digits than its factorization.

20509692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650 (or 6648 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20509692 is about 4528.7627449448. The cubic root of 20509692 is about 273.7283079494.

The spelling of 20509692 in words is "twenty million, five hundred nine thousand, six hundred ninety-two".