20722055 has 8 divisors (see below), whose sum is σ = 25108512. Its totient is φ = 16416288.

The previous prime is 20722007. The next prime is 20722073. The reversal of 20722055 is 55022702.

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

It is a cyclic number.

It is not a de Polignac number, because 20722055 - 2⁶ = 20721991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20722055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19604 + ... + 20633.

It is an arithmetic number, because the mean of its divisors is an integer number (3138564).

Almost surely, 2^20722055 is an apocalyptic number.

20722055 is a deficient number, since it is larger than the sum of its proper divisors (4386457).

20722055 is a wasteful number, since it uses less digits than its factorization.

20722055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40345.

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 20722055 is about 4552.1483938905. The cubic root of 20722055 is about 274.6698185992.

Adding to 20722055 its reverse (55022702), we get a palindrome (75744757).

The spelling of 20722055 in words is "twenty million, seven hundred twenty-two thousand, fifty-five".