20731336 has 16 divisors (see below), whose sum is σ = 38966400. Its totient is φ = 10340304.

The previous prime is 20731327. The next prime is 20731339. The reversal of 20731336 is 63313702.

It is a self number, because there is not a number n which added to its sum of digits gives 20731336.

It is not an unprimeable number, because it can be changed into a prime (20731339) 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, 561 + ... + 6463.

It is an arithmetic number, because the mean of its divisors is an integer number (2435400).

Almost surely, 2^20731336 is an apocalyptic number.

It is an amenable number.

20731336 is a deficient number, since it is larger than the sum of its proper divisors (18235064).

20731336 is a wasteful number, since it uses less digits than its factorization.

20731336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6348 (or 6344 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 25.

The square root of 20731336 is about 4553.1676885439. The cubic root of 20731336 is about 274.7108188781.

The spelling of 20731336 in words is "twenty million, seven hundred thirty-one thousand, three hundred thirty-six".