20722065 has 128 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 7630848.

The previous prime is 20722007. The next prime is 20722073. The reversal of 20722065 is 56022702.

It is not a de Polignac number, because 20722065 - 2⁸ = 20721809 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 440872 + ... + 440918.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^20722065 is an apocalyptic number.

It is an amenable number.

20722065 is an abundant number, since it is smaller than the sum of its proper divisors (25726575).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20722065 is a wasteful number, since it uses less digits than its factorization.

20722065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20722065 is about 4552.1494922729. The cubic root of 20722065 is about 274.6698627824.

Adding to 20722065 its reverse (56022702), we get a palindrome (76744767).

The spelling of 20722065 in words is "twenty million, seven hundred twenty-two thousand, sixty-five".