20400722 has 4 divisors (see below), whose sum is σ = 30601086. Its totient is φ = 10200360.

The previous prime is 20400719. The next prime is 20400803. The reversal of 20400722 is 22700402.

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

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 410881 = 4471^2 + 641^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20400722.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100179 + ... + 5100182.

Almost surely, 2^20400722 is an apocalyptic number.

20400722 is a deficient number, since it is larger than the sum of its proper divisors (10200364).

20400722 is a wasteful number, since it uses less digits than its factorization.

20400722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200363.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 20400722 is about 4516.7158422907. The cubic root of 20400722 is about 273.2426650825.

The spelling of 20400722 in words is "twenty million, four hundred thousand, seven hundred twenty-two".