20625251 has 8 divisors (see below), whose sum is σ = 21362880. Its totient is φ = 19899432.

The previous prime is 20625239. The next prime is 20625257. The reversal of 20625251 is 15252602.

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 20625251 - 2¹⁸ = 20363107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20625257) 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, 680 + ... + 6458.

It is an arithmetic number, because the mean of its divisors is an integer number (2670360).

Almost surely, 2^20625251 is an apocalyptic number.

20625251 is a deficient number, since it is larger than the sum of its proper divisors (737629).

20625251 is an equidigital number, since it uses as much as digits as its factorization.

20625251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20625251 is about 4541.5031652527. The cubic root of 20625251 is about 274.2414400910.

Adding to 20625251 its reverse (15252602), we get a palindrome (35877853).

The spelling of 20625251 in words is "twenty million, six hundred twenty-five thousand, two hundred fifty-one".