20818480 has 20 divisors (see below), whose sum is σ = 48403152. Its totient is φ = 8327360.

The previous prime is 20818477. The next prime is 20818481. The reversal of 20818480 is 8481802.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (20818481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130036 + ... + 130195.

Almost surely, 2^20818480 is an apocalyptic number.

20818480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20818480 is an abundant number, since it is smaller than the sum of its proper divisors (27584672).

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

20818480 is a wasteful number, since it uses less digits than its factorization.

20818480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260244 (or 260238 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 20818480 is about 4562.7272546143. The cubic root of 20818480 is about 275.0951956928.

The spelling of 20818480 in words is "twenty million, eight hundred eighteen thousand, four hundred eighty".