20990592 has 192 divisors, whose sum is σ = 73195200. Its totient is φ = 5640192.

The previous prime is 20990591. The next prime is 20990603. The reversal of 20990592 is 29509902.

It is a tau number, because it is divible by the number of its divisors (192).

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

It is not an unprimeable number, because it can be changed into a prime (20990591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153148 + ... + 153284.

It is an arithmetic number, because the mean of its divisors is an integer number (381225).

Almost surely, 2^20990592 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 20990592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36597600).

20990592 is an abundant number, since it is smaller than the sum of its proper divisors (52204608).

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

20990592 is a wasteful number, since it uses less digits than its factorization.

20990592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 36.

The square root of 20990592 is about 4581.5490830068. The cubic root of 20990592 is about 275.8512115497.

The spelling of 20990592 in words is "twenty million, nine hundred ninety thousand, five hundred ninety-two".