20754639 has 6 divisors (see below), whose sum is σ = 29978936. Its totient is φ = 13836420.

The previous prime is 20754623. The next prime is 20754653. The reversal of 20754639 is 93645702.

It is not a de Polignac number, because 20754639 - 2⁴ = 20754623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20754619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1153027 + ... + 1153044.

Almost surely, 2^20754639 is an apocalyptic number.

20754639 is a deficient number, since it is larger than the sum of its proper divisors (9224297).

20754639 is a wasteful number, since it uses less digits than its factorization.

20754639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306077 (or 2306074 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 20754639 is about 4555.7259575176. The cubic root of 20754639 is about 274.8137096445.

The spelling of 20754639 in words is "twenty million, seven hundred fifty-four thousand, six hundred thirty-nine".