20251345 has 8 divisors (see below), whose sum is σ = 24538176. Its totient is φ = 16043376.

The previous prime is 20251333. The next prime is 20251373. The reversal of 20251345 is 54315202.

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 20251345 - 2²¹ = 18154193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19147 + ... + 20176.

It is an arithmetic number, because the mean of its divisors is an integer number (3067272).

Almost surely, 2^20251345 is an apocalyptic number.

It is an amenable number.

20251345 is a deficient number, since it is larger than the sum of its proper divisors (4286831).

20251345 is a wasteful number, since it uses less digits than its factorization.

20251345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39431.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20251345 is about 4500.1494419630. The cubic root of 20251345 is about 272.5741234263.

Adding to 20251345 its reverse (54315202), we get a palindrome (74566547).

The spelling of 20251345 in words is "twenty million, two hundred fifty-one thousand, three hundred forty-five".