20138772 has 12 divisors (see below), whose sum is σ = 46990496. Its totient is φ = 6712920.

The previous prime is 20138743. The next prime is 20138801. The reversal of 20138772 is 27783102.

It is an interprime number because it is at equal distance from previous prime (20138743) and next prime (20138801).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839104 + ... + 839127.

Almost surely, 2^20138772 is an apocalyptic number.

It is an amenable number.

20138772 is an abundant number, since it is smaller than the sum of its proper divisors (26851724).

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

20138772 is a wasteful number, since it uses less digits than its factorization.

20138772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678238 (or 1678236 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 20138772 is about 4487.6243158268. The cubic root of 20138772 is about 272.0681237959.

It can be divided in two parts, 20138 and 772, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20138772 in words is "twenty million, one hundred thirty-eight thousand, seven hundred seventy-two".