20737680 has 80 divisors (see below), whose sum is σ = 65245824. Its totient is φ = 5447680.

The previous prime is 20737679. The next prime is 20737709. The reversal of 20737680 is 8673702.

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

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, 16432 + ... + 17648.

Almost surely, 2^20737680 is an apocalyptic number.

20737680 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 20737680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32622912).

20737680 is an abundant number, since it is smaller than the sum of its proper divisors (44508144).

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

20737680 is a wasteful number, since it uses less digits than its factorization.

20737680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 20737680 is about 4553.8642931032. The cubic root of 20737680 is about 274.7388374566.

The spelling of 20737680 in words is "twenty million, seven hundred thirty-seven thousand, six hundred eighty".