20364720 has 80 divisors (see below), whose sum is σ = 64361952. Its totient is φ = 5324800.

The previous prime is 20364709. The next prime is 20364739. The reversal of 20364720 is 2746302.

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 (24).

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, 11920 + ... + 13520.

Almost surely, 2^20364720 is an apocalyptic number.

20364720 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 20364720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32180976).

20364720 is an abundant number, since it is smaller than the sum of its proper divisors (43997232).

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

20364720 is a wasteful number, since it uses less digits than its factorization.

20364720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 20364720 is about 4512.7286645665. The cubic root of 20364720 is about 273.0818362180.

The spelling of 20364720 in words is "twenty million, three hundred sixty-four thousand, seven hundred twenty".