20637960 has 128 divisors (see below), whose sum is σ = 71884800. Its totient is φ = 4642560.

The previous prime is 20637941. The next prime is 20637977. The reversal of 20637960 is 6973602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66205 + ... + 66515.

It is an arithmetic number, because the mean of its divisors is an integer number (561600).

Almost surely, 2^20637960 is an apocalyptic number.

20637960 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 20637960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35942400).

20637960 is an abundant number, since it is smaller than the sum of its proper divisors (51246840).

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

20637960 is a wasteful number, since it uses less digits than its factorization.

20637960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 20637960 is about 4542.9021561112. The cubic root of 20637960 is about 274.2977564777.

The spelling of 20637960 in words is "twenty million, six hundred thirty-seven thousand, nine hundred sixty".