20886940 has 12 divisors (see below), whose sum is σ = 43862616. Its totient is φ = 8354768.

The previous prime is 20886919. The next prime is 20886953. The reversal of 20886940 is 4968802.

It is a self number, because there is not a number n which added to its sum of digits gives 20886940.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522154 + ... + 522193.

It is an arithmetic number, because the mean of its divisors is an integer number (3655218).

Almost surely, 2^20886940 is an apocalyptic number.

20886940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20886940 is an abundant number, since it is smaller than the sum of its proper divisors (22975676).

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

20886940 is a wasteful number, since it uses less digits than its factorization.

20886940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044356 (or 1044354 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 20886940 is about 4570.2231892983. The cubic root of 20886940 is about 275.3964090231.

The spelling of 20886940 in words is "twenty million, eight hundred eighty-six thousand, nine hundred forty".