20672890 has 32 divisors (see below), whose sum is σ = 42747264. Its totient is φ = 7051200.

The previous prime is 20672887. The next prime is 20672909. The reversal of 20672890 is 9827602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15240 + ... + 16540.

It is an arithmetic number, because the mean of its divisors is an integer number (1335852).

Almost surely, 2^20672890 is an apocalyptic number.

20672890 is an abundant number, since it is smaller than the sum of its proper divisors (22074374).

20672890 is a wasteful number, since it uses less digits than its factorization.

20672890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20672890 is about 4546.7449895502. The cubic root of 20672890 is about 274.4524200244.

The spelling of 20672890 in words is "twenty million, six hundred seventy-two thousand, eight hundred ninety".