20912992 has 48 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 9566208.

The previous prime is 20912989. The next prime is 20913037. The reversal of 20912992 is 29921902.

It is a Harshad number since it is a multiple of its sum of digits (34).

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 7 ways as a sum of consecutive naturals, for example, 19609 + ... + 20647.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^20912992 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 20912992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22407840).

20912992 is an abundant number, since it is smaller than the sum of its proper divisors (23902688).

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

20912992 is a wasteful number, since it uses less digits than its factorization.

20912992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 20912992 is about 4573.0724901318. The cubic root of 20912992 is about 275.5108608668.

It can be divided in two parts, 20912 and 992, that added together give a square (21904 = 148²).

The spelling of 20912992 in words is "twenty million, nine hundred twelve thousand, nine hundred ninety-two".