20700560 has 80 divisors (see below), whose sum is σ = 52710912. Its totient is φ = 7526400.

The previous prime is 20700553. The next prime is 20700593. The reversal of 20700560 is 6500702.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 41915 + ... + 42405.

Almost surely, 2^20700560 is an apocalyptic number.

20700560 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 20700560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26355456).

20700560 is an abundant number, since it is smaller than the sum of its proper divisors (32010352).

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

20700560 is a wasteful number, since it uses less digits than its factorization.

20700560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20700560 is about 4549.7868081922. The cubic root of 20700560 is about 274.5748140200.

The spelling of 20700560 in words is "twenty million, seven hundred thousand, five hundred sixty".