20724080 has 40 divisors (see below), whose sum is σ = 51892512. Its totient is φ = 7651584.

The previous prime is 20724049. The next prime is 20724091. The reversal of 20724080 is 8042702.

It is a tau number, because it is divible by the number of its divisors (40).

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, 8924 + ... + 11003.

Almost surely, 2^20724080 is an apocalyptic number.

20724080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20724080 is an abundant number, since it is smaller than the sum of its proper divisors (31168432).

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

20724080 is a wasteful number, since it uses less digits than its factorization.

20724080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19953 (or 19947 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 20724080 is about 4552.3708109072. The cubic root of 20724080 is about 274.6787653995.

Adding to 20724080 its reverse (8042702), we get a palindrome (28766782).

The spelling of 20724080 in words is "twenty million, seven hundred twenty-four thousand, eighty".