20332251 has 6 divisors (see below), whose sum is σ = 29368820. Its totient is φ = 13554828.

The previous prime is 20332243. The next prime is 20332259. The reversal of 20332251 is 15223302.

It is an interprime number because it is at equal distance from previous prime (20332243) and next prime (20332259).

It is not a de Polignac number, because 20332251 - 2³ = 20332243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20332259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1129561 + ... + 1129578.

Almost surely, 2^20332251 is an apocalyptic number.

20332251 is a deficient number, since it is larger than the sum of its proper divisors (9036569).

20332251 is a wasteful number, since it uses less digits than its factorization.

20332251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259145 (or 2259142 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20332251 is about 4509.1297386525. The cubic root of 20332251 is about 272.9366274027.

Adding to 20332251 its reverse (15223302), we get a palindrome (35555553).

The spelling of 20332251 in words is "twenty million, three hundred thirty-two thousand, two hundred fifty-one".