20591922 has 64 divisors (see below), whose sum is σ = 46738944. Its totient is φ = 6005760.

The previous prime is 20591911. The next prime is 20591927. The reversal of 20591922 is 22919502.

It is a self number, because there is not a number n which added to its sum of digits gives 20591922.

It is not an unprimeable number, because it can be changed into a prime (20591927) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150238 + ... + 150374.

It is an arithmetic number, because the mean of its divisors is an integer number (730296).

Almost surely, 2^20591922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20591922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23369472).

20591922 is an abundant number, since it is smaller than the sum of its proper divisors (26147022).

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

20591922 is a wasteful number, since it uses less digits than its factorization.

20591922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20591922 is about 4537.8323018816. The cubic root of 20591922 is about 274.0936419593.

The spelling of 20591922 in words is "twenty million, five hundred ninety-one thousand, nine hundred twenty-two".