20744680 has 32 divisors (see below), whose sum is σ = 50919840. Its totient is φ = 7543360.

The previous prime is 20744671. The next prime is 20744681. The reversal of 20744680 is 8644702.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20744681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23134 + ... + 24013.

It is an arithmetic number, because the mean of its divisors is an integer number (1591245).

Almost surely, 2^20744680 is an apocalyptic number.

20744680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20744680 is an abundant number, since it is smaller than the sum of its proper divisors (30175160).

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

20744680 is a wasteful number, since it uses less digits than its factorization.

20744680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47169 (or 47165 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20744680 is about 4554.6328062754. The cubic root of 20744680 is about 274.7697466601.

The spelling of 20744680 in words is "twenty million, seven hundred forty-four thousand, six hundred eighty".