20094561 has 20 divisors (see below), whose sum is σ = 31785732. Its totient is φ = 12607488.

The previous prime is 20094553. The next prime is 20094563. The reversal of 20094561 is 16549002.

20094561 is a `hidden beast` number, since 200 + 9 + 456 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8088336 + 12006225 = 2844^2 + 3465^2 .

It is not a de Polignac number, because 20094561 - 2³ = 20094553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20094563) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5920 + ... + 8673.

Almost surely, 2^20094561 is an apocalyptic number.

It is an amenable number.

20094561 is a deficient number, since it is larger than the sum of its proper divisors (11691171).

20094561 is a wasteful number, since it uses less digits than its factorization.

20094561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14622 (or 14613 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 20094561 is about 4482.6957291344. The cubic root of 20094561 is about 271.8688859505.

The spelling of 20094561 in words is "twenty million, ninety-four thousand, five hundred sixty-one".