20032251 has 24 divisors (see below), whose sum is σ = 28803600. Its totient is φ = 12377664.

The previous prime is 20032249. The next prime is 20032253. The reversal of 20032251 is 15223002.

It is an interprime number because it is at equal distance from previous prime (20032249) and next prime (20032253).

It is not a de Polignac number, because 20032251 - 2¹ = 20032249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20032251.

It is not an unprimeable number, because it can be changed into a prime (20032253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57225 + ... + 57573.

It is an arithmetic number, because the mean of its divisors is an integer number (1200150).

Almost surely, 2^20032251 is an apocalyptic number.

20032251 is a deficient number, since it is larger than the sum of its proper divisors (8771349).

20032251 is a wasteful number, since it uses less digits than its factorization.

20032251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 424 counting only the distinct ones).

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

The square root of 20032251 is about 4475.7402739659. The cubic root of 20032251 is about 271.5875877745.

Adding to 20032251 its reverse (15223002), we get a palindrome (35255253).

Subtracting from 20032251 its reverse (15223002), we obtain a square (4809249 = 2193²).

The spelling of 20032251 in words is "twenty million, thirty-two thousand, two hundred fifty-one".