20309974 has 8 divisors (see below), whose sum is σ = 32068440. Its totient is φ = 9620496.

The previous prime is 20309959. The next prime is 20309999. The reversal of 20309974 is 47990302.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267199 + ... + 267274.

It is an arithmetic number, because the mean of its divisors is an integer number (4008555).

Almost surely, 2^20309974 is an apocalyptic number.

20309974 is a deficient number, since it is larger than the sum of its proper divisors (11758466).

20309974 is a wasteful number, since it uses less digits than its factorization.

20309974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534494.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20309974 is about 4506.6588510780. The cubic root of 20309974 is about 272.8369101080.

The spelling of 20309974 in words is "twenty million, three hundred nine thousand, nine hundred seventy-four".