20947392 has 84 divisors (see below), whose sum is σ = 61575696. Its totient is φ = 6804480.

The previous prime is 20947391. The next prime is 20947393. The reversal of 20947392 is 29374902.

It is an interprime number because it is at equal distance from previous prime (20947391) and next prime (20947393).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23173 + ... + 24059.

It is an arithmetic number, because the mean of its divisors is an integer number (733044).

Almost surely, 2^20947392 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 20947392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30787848).

20947392 is an abundant number, since it is smaller than the sum of its proper divisors (40628304).

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

20947392 is a wasteful number, since it uses less digits than its factorization.

20947392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20947392 is about 4576.8320921790. The cubic root of 20947392 is about 275.6618416824.

The spelling of 20947392 in words is "twenty million, nine hundred forty-seven thousand, three hundred ninety-two".