20748638 has 16 divisors (see below), whose sum is σ = 32117904. Its totient is φ = 10045440.

The previous prime is 20748617. The next prime is 20748677. The reversal of 20748638 is 83684702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18473 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (2007369).

Almost surely, 2^20748638 is an apocalyptic number.

20748638 is a deficient number, since it is larger than the sum of its proper divisors (11369266).

20748638 is a wasteful number, since it uses less digits than its factorization.

20748638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20748638 is about 4555.0672881967. The cubic root of 20748638 is about 274.7872205297.

The spelling of 20748638 in words is "twenty million, seven hundred forty-eight thousand, six hundred thirty-eight".