20981464 has 16 divisors (see below), whose sum is σ = 44960400. Its totient is φ = 8992032.

The previous prime is 20981461. The next prime is 20981473. The reversal of 20981464 is 46418902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20981461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187279 + ... + 187390.

It is an arithmetic number, because the mean of its divisors is an integer number (2810025).

Almost surely, 2^20981464 is an apocalyptic number.

It is an amenable number.

20981464 is an abundant number, since it is smaller than the sum of its proper divisors (23978936).

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

20981464 is a wasteful number, since it uses less digits than its factorization.

20981464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374682 (or 374678 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20981464 is about 4580.5528050662. The cubic root of 20981464 is about 275.8112200631.

The spelling of 20981464 in words is "twenty million, nine hundred eighty-one thousand, four hundred sixty-four".