20686392 has 48 divisors (see below), whose sum is σ = 57227040. Its totient is φ = 6747648.

The previous prime is 20686373. The next prime is 20686409. The reversal of 20686392 is 29368602.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 328 + ... + 6440.

It is an arithmetic number, because the mean of its divisors is an integer number (1192230).

Almost surely, 2^20686392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20686392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28613520).

20686392 is an abundant number, since it is smaller than the sum of its proper divisors (36540648).

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

20686392 is a wasteful number, since it uses less digits than its factorization.

20686392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172 (or 6165 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 20686392 is about 4548.2295456584. The cubic root of 20686392 is about 274.5121576826.

The spelling of 20686392 in words is "twenty million, six hundred eighty-six thousand, three hundred ninety-two".