20874290 has 16 divisors (see below), whose sum is σ = 38589912. Its totient is φ = 8123904.

The previous prime is 20874257. The next prime is 20874299. The reversal of 20874290 is 9247802.

It can be written as a sum of positive squares in 4 ways, for example, as 20187049 + 687241 = 4493^2 + 829^2 .

It is not an unprimeable number, because it can be changed into a prime (20874299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27839 + ... + 28578.

Almost surely, 2^20874290 is an apocalyptic number.

20874290 is a deficient number, since it is larger than the sum of its proper divisors (17715622).

20874290 is a wasteful number, since it uses less digits than its factorization.

20874290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56461.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20874290 is about 4568.8390210205. The cubic root of 20874290 is about 275.3408006203.

It can be divided in two parts, 20874 and 290, that multiplied together give a triangular number (6053460 = T₃₄₇₉).

The spelling of 20874290 in words is "twenty million, eight hundred seventy-four thousand, two hundred ninety".