20525138 has 4 divisors (see below), whose sum is σ = 30787710. Its totient is φ = 10262568.

The previous prime is 20525129. The next prime is 20525159. The reversal of 20525138 is 83152502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12271009 + 8254129 = 3503^2 + 2873^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5131283 + ... + 5131286.

Almost surely, 2^20525138 is an apocalyptic number.

20525138 is a deficient number, since it is larger than the sum of its proper divisors (10262572).

20525138 is a wasteful number, since it uses less digits than its factorization.

20525138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10262571.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20525138 is about 4530.4677462708. The cubic root of 20525138 is about 273.7970063077.

The spelling of 20525138 in words is "twenty million, five hundred twenty-five thousand, one hundred thirty-eight".