20221001 has 4 divisors (see below), whose sum is σ = 20240532. Its totient is φ = 20201472.

The previous prime is 20220983. The next prime is 20221009. The reversal of 20221001 is 10012202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8497225 + 11723776 = 2915^2 + 3424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20221001.

It is not an unprimeable number, because it can be changed into a prime (20221009) 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, 8120 + ... + 10313.

It is an arithmetic number, because the mean of its divisors is an integer number (5060133).

Almost surely, 2^20221001 is an apocalyptic number.

It is an amenable number.

20221001 is a deficient number, since it is larger than the sum of its proper divisors (19531).

20221001 is a wasteful number, since it uses less digits than its factorization.

20221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19530.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 20221001 is about 4496.7767345066. The cubic root of 20221001 is about 272.4379164461.

Adding to 20221001 its reverse (10012202), we get a palindrome (30233203).

The spelling of 20221001 in words is "twenty million, two hundred twenty-one thousand, one".