20722001 has 8 divisors (see below), whose sum is σ = 21266784. Its totient is φ = 20180160.

The previous prime is 20721991. The next prime is 20722007. The reversal of 20722001 is 10022702.

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 20722001 - 2²² = 16527697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20722007) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23081 + ... + 23961.

It is an arithmetic number, because the mean of its divisors is an integer number (2658348).

Almost surely, 2^20722001 is an apocalyptic number.

It is an amenable number.

20722001 is a deficient number, since it is larger than the sum of its proper divisors (544783).

20722001 is an equidigital number, since it uses as much as digits as its factorization.

20722001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 20722001 is about 4552.1424626213. The cubic root of 20722001 is about 274.6695800099.

Adding to 20722001 its reverse (10022702), we get a palindrome (30744703).

The spelling of 20722001 in words is "twenty million, seven hundred twenty-two thousand, one".