20936580 has 96 divisors (see below), whose sum is σ = 67952640. Its totient is φ = 4717440.

The previous prime is 20936567. The next prime is 20936581. The reversal of 20936580 is 8563902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20936581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32865 + ... + 33495.

It is an arithmetic number, because the mean of its divisors is an integer number (707840).

Almost surely, 2^20936580 is an apocalyptic number.

20936580 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 20936580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33976320).

20936580 is an abundant number, since it is smaller than the sum of its proper divisors (47016060).

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

20936580 is a wasteful number, since it uses less digits than its factorization.

20936580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 727 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20936580 is about 4575.6507733873. The cubic root of 20936580 is about 275.6144058844.

The spelling of 20936580 in words is "twenty million, nine hundred thirty-six thousand, five hundred eighty".