20686472 has 16 divisors (see below), whose sum is σ = 39085200. Its totient is φ = 10263760.

The previous prime is 20686447. The next prime is 20686513. The reversal of 20686472 is 27468602.

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, 8822 + ... + 10917.

It is an arithmetic number, because the mean of its divisors is an integer number (2442825).

Almost surely, 2^20686472 is an apocalyptic number.

It is an amenable number.

20686472 is a deficient number, since it is larger than the sum of its proper divisors (18398728).

20686472 is a wasteful number, since it uses less digits than its factorization.

20686472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19876 (or 19872 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 20686472 is about 4548.2383402808. The cubic root of 20686472 is about 274.5125115537.

The spelling of 20686472 in words is "twenty million, six hundred eighty-six thousand, four hundred seventy-two".