20722357 has 4 divisors (see below), whose sum is σ = 20734560. Its totient is φ = 20710156.

The previous prime is 20722349. The next prime is 20722367. The reversal of 20722357 is 75322702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20722357 - 2³ = 20722349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722307) 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, 3043 + ... + 7120.

It is an arithmetic number, because the mean of its divisors is an integer number (5183640).

Almost surely, 2^20722357 is an apocalyptic number.

It is an amenable number.

20722357 is a deficient number, since it is larger than the sum of its proper divisors (12203).

20722357 is a wasteful number, since it uses less digits than its factorization.

20722357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12202.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20722357 is about 4552.1815649203. The cubic root of 20722357 is about 274.6711529244.

The spelling of 20722357 in words is "twenty million, seven hundred twenty-two thousand, three hundred fifty-seven".