20391274 has 8 divisors (see below), whose sum is σ = 30955680. Its totient is φ = 10072716.

The previous prime is 20391257. The next prime is 20391281. The reversal of 20391274 is 47219302.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 61254 + ... + 61585.

It is an arithmetic number, because the mean of its divisors is an integer number (3869460).

Almost surely, 2^20391274 is an apocalyptic number.

20391274 is a deficient number, since it is larger than the sum of its proper divisors (10564406).

20391274 is a wasteful number, since it uses less digits than its factorization.

20391274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122924.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20391274 is about 4515.6698284972. The cubic root of 20391274 is about 273.2004771094.

The spelling of 20391274 in words is "twenty million, three hundred ninety-one thousand, two hundred seventy-four".