20336728 has 8 divisors (see below), whose sum is σ = 38131380. Its totient is φ = 10168360.

The previous prime is 20336689. The next prime is 20336737. The reversal of 20336728 is 82763302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 20336728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271038 + ... + 1271053.

Almost surely, 2^20336728 is an apocalyptic number.

It is an amenable number.

20336728 is a deficient number, since it is larger than the sum of its proper divisors (17794652).

20336728 is a wasteful number, since it uses less digits than its factorization.

20336728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2542097 (or 2542093 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 20336728 is about 4509.6261485848. The cubic root of 20336728 is about 272.9566587575.

The spelling of 20336728 in words is "twenty million, three hundred thirty-six thousand, seven hundred twenty-eight".