20156394 has 16 divisors (see below), whose sum is σ = 40360320. Its totient is φ = 6710880.

The previous prime is 20156369. The next prime is 20156401. The reversal of 20156394 is 49365102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6022 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (2522520).

Almost surely, 2^20156394 is an apocalyptic number.

20156394 is an abundant number, since it is smaller than the sum of its proper divisors (20203926).

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

20156394 is a wasteful number, since it uses less digits than its factorization.

20156394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20156394 is about 4489.5872861545. The cubic root of 20156394 is about 272.1474564508.

The spelling of 20156394 in words is "twenty million, one hundred fifty-six thousand, three hundred ninety-four".