20253021 has 8 divisors (see below), whose sum is σ = 27027264. Its totient is φ = 13490400.

The previous prime is 20253017. The next prime is 20253029. The reversal of 20253021 is 12035202.

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

It is not a de Polignac number, because 20253021 - 2² = 20253017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20253029) 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, 2721 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (3378408).

Almost surely, 2^20253021 is an apocalyptic number.

It is an amenable number.

20253021 is a deficient number, since it is larger than the sum of its proper divisors (6774243).

20253021 is a wasteful number, since it uses less digits than its factorization.

20253021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20253021 is about 4500.3356541485. The cubic root of 20253021 is about 272.5816426244.

Adding to 20253021 its reverse (12035202), we get a palindrome (32288223).

The spelling of 20253021 in words is "twenty million, two hundred fifty-three thousand, twenty-one".