20287974 has 32 divisors (see below), whose sum is σ = 46506240. Its totient is φ = 5779872.

The previous prime is 20287961. The next prime is 20287997. The reversal of 20287974 is 47978202.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27312 + ... + 28044.

It is an arithmetic number, because the mean of its divisors is an integer number (1453320).

Almost surely, 2^20287974 is an apocalyptic number.

20287974 is an abundant number, since it is smaller than the sum of its proper divisors (26218266).

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

20287974 is a wasteful number, since it uses less digits than its factorization.

20287974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20287974 is about 4504.2173570999. The cubic root of 20287974 is about 272.7383611451.

The spelling of 20287974 in words is "twenty million, two hundred eighty-seven thousand, nine hundred seventy-four".