20701638 has 24 divisors (see below), whose sum is σ = 45949176. Its totient is φ = 6732000.

The previous prime is 20701627. The next prime is 20701649. The reversal of 20701638 is 83610702.

20701638 is a `hidden beast` number, since 20 + 7 + 0 + 1 + 638 = 666.

It is an interprime number because it is at equal distance from previous prime (20701627) and next prime (20701649).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13288 + ... + 14763.

It is an arithmetic number, because the mean of its divisors is an integer number (1914549).

Almost surely, 2^20701638 is an apocalyptic number.

20701638 is an abundant number, since it is smaller than the sum of its proper divisors (25247538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20701638 is a wasteful number, since it uses less digits than its factorization.

20701638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28100 (or 28097 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20701638 is about 4549.9052737392. The cubic root of 20701638 is about 274.5795801795.

The spelling of 20701638 in words is "twenty million, seven hundred one thousand, six hundred thirty-eight".