20572720 has 80 divisors (see below), whose sum is σ = 57907008. Its totient is φ = 6635520.

The previous prime is 20572709. The next prime is 20572729. The reversal of 20572720 is 2727502.

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

It is not an unprimeable number, because it can be changed into a prime (20572729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8440 + ... + 10600.

Almost surely, 2^20572720 is an apocalyptic number.

20572720 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 20572720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28953504).

20572720 is an abundant number, since it is smaller than the sum of its proper divisors (37334288).

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

20572720 is a wasteful number, since it uses less digits than its factorization.

20572720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198 (or 2192 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20572720 is about 4535.7160404946. The cubic root of 20572720 is about 274.0084178777.

The spelling of 20572720 in words is "twenty million, five hundred seventy-two thousand, seven hundred twenty".