20639922 has 8 divisors (see below), whose sum is σ = 41279856. Its totient is φ = 6879972.

The previous prime is 20639903. The next prime is 20639923. The reversal of 20639922 is 22993602.

It is a happy number.

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

20639922 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20639923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1719988 + ... + 1719999.

It is an arithmetic number, because the mean of its divisors is an integer number (5159982).

Almost surely, 2^20639922 is an apocalyptic number.

20639922 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20639922 is a wasteful number, since it uses less digits than its factorization.

20639922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439992.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 20639922 is about 4543.1180922358. The cubic root of 20639922 is about 274.3064484729.

The spelling of 20639922 in words is "twenty million, six hundred thirty-nine thousand, nine hundred twenty-two".