20436894 has 32 divisors (see below), whose sum is σ = 47808000. Its totient is φ = 6453432.

The previous prime is 20436877. The next prime is 20436929. The reversal of 20436894 is 49863402.

It is a happy number.

20436894 is a `hidden beast` number, since 204 + 368 + 94 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8934 + ... + 10985.

It is an arithmetic number, because the mean of its divisors is an integer number (1494000).

Almost surely, 2^20436894 is an apocalyptic number.

20436894 is an abundant number, since it is smaller than the sum of its proper divisors (27371106).

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

20436894 is a wasteful number, since it uses less digits than its factorization.

20436894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19949 (or 19943 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20436894 is about 4520.7183057563. The cubic root of 20436894 is about 273.4040629307.

The spelling of 20436894 in words is "twenty million, four hundred thirty-six thousand, eight hundred ninety-four".