20399822 has 4 divisors (see below), whose sum is σ = 30599736. Its totient is φ = 10199910.

The previous prime is 20399807. The next prime is 20399831. The reversal of 20399822 is 22899302.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5099954 + ... + 5099957.

It is an arithmetic number, because the mean of its divisors is an integer number (7649934).

Almost surely, 2^20399822 is an apocalyptic number.

20399822 is a deficient number, since it is larger than the sum of its proper divisors (10199914).

20399822 is a wasteful number, since it uses less digits than its factorization.

20399822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10199913.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20399822 is about 4516.6162112803. The cubic root of 20399822 is about 273.2386468911.

The spelling of 20399822 in words is "twenty million, three hundred ninety-nine thousand, eight hundred twenty-two".