20686732 has 12 divisors (see below), whose sum is σ = 39492936. Its totient is φ = 9403040.

The previous prime is 20686727. The next prime is 20686733. The reversal of 20686732 is 23768602.

It is not an unprimeable number, because it can be changed into a prime (20686733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235033 + ... + 235120.

It is an arithmetic number, because the mean of its divisors is an integer number (3291078).

Almost surely, 2^20686732 is an apocalyptic number.

20686732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20686732 is a deficient number, since it is larger than the sum of its proper divisors (18806204).

20686732 is a wasteful number, since it uses less digits than its factorization.

20686732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470168 (or 470166 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20686732 is about 4548.2669226860. The cubic root of 20686732 is about 274.5136616282.

The spelling of 20686732 in words is "twenty million, six hundred eighty-six thousand, seven hundred thirty-two".