20613760 has 64 divisors (see below), whose sum is σ = 50918400. Its totient is φ = 7971840.

The previous prime is 20613737. The next prime is 20613781. The reversal of 20613760 is 6731602.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19321 + ... + 20359.

It is an arithmetic number, because the mean of its divisors is an integer number (795600).

Almost surely, 2^20613760 is an apocalyptic number.

20613760 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 20613760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25459200).

20613760 is an abundant number, since it is smaller than the sum of its proper divisors (30304640).

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

20613760 is a wasteful number, since it uses less digits than its factorization.

20613760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20613760 is about 4540.2378792306. The cubic root of 20613760 is about 274.1905010131.

The spelling of 20613760 in words is "twenty million, six hundred thirteen thousand, seven hundred sixty".