20617480 has 64 divisors (see below), whose sum is σ = 51609600. Its totient is φ = 7361280.

The previous prime is 20617469. The next prime is 20617517. The reversal of 20617480 is 8471602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15481 + ... + 16759.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^20617480 is an apocalyptic number.

20617480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20617480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25804800).

20617480 is an abundant number, since it is smaller than the sum of its proper divisors (30992120).

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

20617480 is a wasteful number, since it uses less digits than its factorization.

20617480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20617480 is about 4540.6475309145. The cubic root of 20617480 is about 274.2069936749.

The spelling of 20617480 in words is "twenty million, six hundred seventeen thousand, four hundred eighty".