20728822 has 4 divisors (see below), whose sum is σ = 31093236. Its totient is φ = 10364410.

The previous prime is 20728817. The next prime is 20728847. The reversal of 20728822 is 22882702.

It is a happy number.

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, 5182204 + ... + 5182207.

It is an arithmetic number, because the mean of its divisors is an integer number (7773309).

Almost surely, 2^20728822 is an apocalyptic number.

20728822 is a deficient number, since it is larger than the sum of its proper divisors (10364414).

20728822 is a wasteful number, since it uses less digits than its factorization.

20728822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10364413.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 20728822 is about 4552.8916086373. The cubic root of 20728822 is about 274.6997140958.

The spelling of 20728822 in words is "twenty million, seven hundred twenty-eight thousand, eight hundred twenty-two".