20622721 has 8 divisors (see below), whose sum is σ = 23647104. Its totient is φ = 17617920.

The previous prime is 20622689. The next prime is 20622737. The reversal of 20622721 is 12722602.

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 20622721 - 2⁵ = 20622689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20622692 and 20622701.

It is not an unprimeable number, because it can be changed into a prime (20622821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 6913.

It is an arithmetic number, because the mean of its divisors is an integer number (2955888).

Almost surely, 2^20622721 is an apocalyptic number.

It is an amenable number.

20622721 is a deficient number, since it is larger than the sum of its proper divisors (3024383).

20622721 is an equidigital number, since it uses as much as digits as its factorization.

20622721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9791.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20622721 is about 4541.2246145726. The cubic root of 20622721 is about 274.2302263412.

The spelling of 20622721 in words is "twenty million, six hundred twenty-two thousand, seven hundred twenty-one".