20668370 has 16 divisors (see below), whose sum is σ = 37399320. Its totient is φ = 8223744.

The previous prime is 20668367. The next prime is 20668397. The reversal of 20668370 is 7386602.

It can be written as a sum of positive squares in 4 ways, for example, as 18826921 + 1841449 = 4339^2 + 1357^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3425 + ... + 7284.

Almost surely, 2^20668370 is an apocalyptic number.

20668370 is a deficient number, since it is larger than the sum of its proper divisors (16730950).

20668370 is a wasteful number, since it uses less digits than its factorization.

20668370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20668370 is about 4546.2479034914. The cubic root of 20668370 is about 274.4324161230.

The spelling of 20668370 in words is "twenty million, six hundred sixty-eight thousand, three hundred seventy".