20739388 has 24 divisors (see below), whose sum is σ = 39472272. Its totient is φ = 9494784.

The previous prime is 20739347. The next prime is 20739421. The reversal of 20739388 is 88393702.

It is a happy number.

It is a super-2 number, since 2×20739388² = 860244429229088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20739388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (1644678).

Almost surely, 2^20739388 is an apocalyptic number.

It is an amenable number.

20739388 is a deficient number, since it is larger than the sum of its proper divisors (18732884).

20739388 is a wasteful number, since it uses less digits than its factorization.

20739388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8301 (or 8299 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20739388 is about 4554.0518222787. The cubic root of 20739388 is about 274.7463799437.

The spelling of 20739388 in words is "twenty million, seven hundred thirty-nine thousand, three hundred eighty-eight".