20966481 has 12 divisors (see below), whose sum is σ = 31879120. Its totient is φ = 13241880.

The previous prime is 20966479. The next prime is 20966537. The reversal of 20966481 is 18466902.

20966481 is a `hidden beast` number, since 2 + 0 + 9 + 6 + 648 + 1 = 666.

It is not a de Polignac number, because 20966481 - 2¹ = 20966479 is a prime.

It is a super-2 number, since 2×20966481² = 879186651046722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20966411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61135 + ... + 61476.

Almost surely, 2^20966481 is an apocalyptic number.

It is an amenable number.

20966481 is a deficient number, since it is larger than the sum of its proper divisors (10912639).

20966481 is a wasteful number, since it uses less digits than its factorization.

20966481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122636 (or 122633 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20966481 is about 4578.9170116961. The cubic root of 20966481 is about 275.7455515667.

The spelling of 20966481 in words is "twenty million, nine hundred sixty-six thousand, four hundred eighty-one".