20566494 has 32 divisors (see below), whose sum is σ = 49220640. Its totient is φ = 6327936.

The previous prime is 20566489. The next prime is 20566501. The reversal of 20566494 is 49466502.

20566494 is a `hidden beast` number, since 2 + 0 + 5 + 6 + 649 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13947 + ... + 15350.

It is an arithmetic number, because the mean of its divisors is an integer number (1538145).

Almost surely, 2^20566494 is an apocalyptic number.

20566494 is an abundant number, since it is smaller than the sum of its proper divisors (28654146).

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

20566494 is a wasteful number, since it uses less digits than its factorization.

20566494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29321 (or 29315 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 20566494 is about 4535.0296581169. The cubic root of 20566494 is about 273.9807736878.

The spelling of 20566494 in words is "twenty million, five hundred sixty-six thousand, four hundred ninety-four".