20021901 has 8 divisors (see below), whose sum is σ = 26764704. Its totient is φ = 13313520.

The previous prime is 20021887. The next prime is 20021917. The reversal of 20021901 is 10912002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021901 - 2¹⁸ = 19759757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021951) 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, 7215 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (3345588).

Almost surely, 2^20021901 is an apocalyptic number.

It is an amenable number.

20021901 is a deficient number, since it is larger than the sum of its proper divisors (6742803).

20021901 is a wasteful number, since it uses less digits than its factorization.

20021901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17211.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20021901 is about 4474.5838912686. The cubic root of 20021901 is about 271.5408062824.

Adding to 20021901 its reverse (10912002), we get a palindrome (30933903).

The spelling of 20021901 in words is "twenty million, twenty-one thousand, nine hundred one".