20448980 has 12 divisors (see below), whose sum is σ = 42942900. Its totient is φ = 8179584.

The previous prime is 20448949. The next prime is 20448991. The reversal of 20448980 is 8984402.

It can be written as a sum of positive squares in 2 ways, for example, as 11316496 + 9132484 = 3364^2 + 3022^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20448980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511205 + ... + 511244.

It is an arithmetic number, because the mean of its divisors is an integer number (3578575).

Almost surely, 2^20448980 is an apocalyptic number.

20448980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20448980 is an abundant number, since it is smaller than the sum of its proper divisors (22493920).

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

20448980 is a wasteful number, since it uses less digits than its factorization.

20448980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022458 (or 1022456 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20448980 is about 4522.0548426573. The cubic root of 20448980 is about 273.4579476736.

The spelling of 20448980 in words is "twenty million, four hundred forty-eight thousand, nine hundred eighty".