20989274 has 8 divisors (see below), whose sum is σ = 31505760. Its totient is φ = 10487356.

The previous prime is 20989229. The next prime is 20989279. The reversal of 20989274 is 47298902.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20989279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307 + ... + 6609.

It is an arithmetic number, because the mean of its divisors is an integer number (3938220).

Almost surely, 2^20989274 is an apocalyptic number.

20989274 is a deficient number, since it is larger than the sum of its proper divisors (10516486).

20989274 is a wasteful number, since it uses less digits than its factorization.

20989274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7284.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20989274 is about 4581.4052429358. The cubic root of 20989274 is about 275.8454378598.

The spelling of 20989274 in words is "twenty million, nine hundred eighty-nine thousand, two hundred seventy-four".