20831474 has 4 divisors (see below), whose sum is σ = 31247214. Its totient is φ = 10415736.

The previous prime is 20831323. The next prime is 20831533. The reversal of 20831474 is 47413802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13579225 + 7252249 = 3685^2 + 2693^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5207867 + ... + 5207870.

Almost surely, 2^20831474 is an apocalyptic number.

20831474 is a deficient number, since it is larger than the sum of its proper divisors (10415740).

20831474 is a wasteful number, since it uses less digits than its factorization.

20831474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10415739.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 20831474 is about 4564.1509615700. The cubic root of 20831474 is about 275.1524179865.

The spelling of 20831474 in words is "twenty million, eight hundred thirty-one thousand, four hundred seventy-four".