20762138 has 4 divisors (see below), whose sum is σ = 31143210. Its totient is φ = 10381068.

The previous prime is 20762129. The next prime is 20762141. The reversal of 20762138 is 83126702.

It is a happy number.

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., 16297369 + 4464769 = 4037^2 + 2113^2 .

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 20762138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5190533 + ... + 5190536.

Almost surely, 2^20762138 is an apocalyptic number.

20762138 is a deficient number, since it is larger than the sum of its proper divisors (10381072).

20762138 is a wasteful number, since it uses less digits than its factorization.

20762138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381071.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20762138 is about 4556.5489133773. The cubic root of 20762138 is about 274.8468039301.

The spelling of 20762138 in words is "twenty million, seven hundred sixty-two thousand, one hundred thirty-eight".