20490912 has 108 divisors (see below), whose sum is σ = 63248094. Its totient is φ = 6289920.

The previous prime is 20490839. The next prime is 20490917. The reversal of 20490912 is 21909402.

It can be written as a sum of positive squares in 3 ways, for example, as 3549456 + 16941456 = 1884^2 + 4116^2 .

It is not an unprimeable number, because it can be changed into a prime (20490917) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48462 + ... + 48882.

Almost surely, 2^20490912 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 20490912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31624047).

20490912 is an abundant number, since it is smaller than the sum of its proper divisors (42757182).

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

20490912 is a wasteful number, since it uses less digits than its factorization.

20490912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 20490912 is about 4526.6888561066. The cubic root of 20490912 is about 273.6447346572.

The spelling of 20490912 in words is "twenty million, four hundred ninety thousand, nine hundred twelve".