20722669 has 4 divisors (see below), whose sum is σ = 22606560. Its totient is φ = 18838780.

The previous prime is 20722661. The next prime is 20722687. The reversal of 20722669 is 96622702.

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 20722669 - 2³ = 20722661 is a prime.

It is a super-2 number, since 2×20722669² = 858858020967122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20722661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941929 + ... + 941950.

It is an arithmetic number, because the mean of its divisors is an integer number (5651640).

Almost surely, 2^20722669 is an apocalyptic number.

It is an amenable number.

20722669 is a deficient number, since it is larger than the sum of its proper divisors (1883891).

20722669 is a wasteful number, since it uses less digits than its factorization.

20722669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883890.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20722669 is about 4552.2158340747. The cubic root of 20722669 is about 274.6725314190.

The spelling of 20722669 in words is "twenty million, seven hundred twenty-two thousand, six hundred sixty-nine".