20713538 has 8 divisors (see below), whose sum is σ = 31186620. Its totient is φ = 10318000.

The previous prime is 20713529. The next prime is 20713541. The reversal of 20713538 is 83531702.

It can be written as a sum of positive squares in 2 ways, for example, as 20403289 + 310249 = 4517^2 + 557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20713538.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18713 + ... + 19788.

Almost surely, 2^20713538 is an apocalyptic number.

20713538 is a deficient number, since it is larger than the sum of its proper divisors (10473082).

20713538 is a wasteful number, since it uses less digits than its factorization.

20713538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38772.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20713538 is about 4551.2128053959. The cubic root of 20713538 is about 274.6321826373.

The spelling of 20713538 in words is "twenty million, seven hundred thirteen thousand, five hundred thirty-eight".