20959880 has 16 divisors (see below), whose sum is σ = 47159820. Its totient is φ = 8383936.

The previous prime is 20959853. The next prime is 20959889. The reversal of 20959880 is 8895902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20666116 + 293764 = 4546^2 + 542^2 .

It is a super-2 number, since 2×20959880² = 878633139228800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20959889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261959 + ... + 262038.

Almost surely, 2^20959880 is an apocalyptic number.

20959880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20959880 is an abundant number, since it is smaller than the sum of its proper divisors (26199940).

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

20959880 is a wasteful number, since it uses less digits than its factorization.

20959880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524008 (or 524004 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 20959880 is about 4578.1961513242. The cubic root of 20959880 is about 275.7166103336.

The spelling of 20959880 in words is "twenty million, nine hundred fifty-nine thousand, eight hundred eighty".