20390922 has 48 divisors (see below), whose sum is σ = 48070152. Its totient is φ = 6220800.

The previous prime is 20390911. The next prime is 20390941. The reversal of 20390922 is 22909302.

It can be written as a sum of positive squares in 4 ways, for example, as 19368801 + 1022121 = 4401^2 + 1011^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10422 + ... + 12222.

Almost surely, 2^20390922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20390922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24035076).

20390922 is an abundant number, since it is smaller than the sum of its proper divisors (27679230).

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

20390922 is a wasteful number, since it uses less digits than its factorization.

20390922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20390922 is about 4515.6308529374. The cubic root of 20390922 is about 273.1989050788.

It can be divided in two parts, 20390 and 922, that added together give a palindrome (21312).

The spelling of 20390922 in words is "twenty million, three hundred ninety thousand, nine hundred twenty-two".