20743992 has 64 divisors (see below), whose sum is σ = 58125600. Its totient is φ = 6854400.

The previous prime is 20743979. The next prime is 20744021. The reversal of 20743992 is 29934702.

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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29242 + ... + 29942.

Almost surely, 2^20743992 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 20743992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29062800).

20743992 is an abundant number, since it is smaller than the sum of its proper divisors (37381608).

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

20743992 is a wasteful number, since it uses less digits than its factorization.

20743992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 843 counting only the distinct ones).

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

The square root of 20743992 is about 4554.5572781556. The cubic root of 20743992 is about 274.7667090351.

The spelling of 20743992 in words is "twenty million, seven hundred forty-three thousand, nine hundred ninety-two".