20943251 has 8 divisors (see below), whose sum is σ = 24519264. Its totient is φ = 17513280.

The previous prime is 20943203. The next prime is 20943253. The reversal of 20943251 is 15234902.

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 20943251 - 2¹⁸ = 20681107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20943251.

It is not an unprimeable number, because it can be changed into a prime (20943253) 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, 36200 + ... + 36773.

It is an arithmetic number, because the mean of its divisors is an integer number (3064908).

Almost surely, 2^20943251 is an apocalyptic number.

20943251 is a deficient number, since it is larger than the sum of its proper divisors (3576013).

20943251 is an equidigital number, since it uses as much as digits as its factorization.

20943251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73021.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20943251 is about 4576.3796826749. The cubic root of 20943251 is about 275.6436756833.

The spelling of 20943251 in words is "twenty million, nine hundred forty-three thousand, two hundred fifty-one".