20451371 has 8 divisors (see below), whose sum is σ = 20782944. Its totient is φ = 20122560.

The previous prime is 20451329. The next prime is 20451373. The reversal of 20451371 is 17315402.

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 20451371 - 2¹⁸ = 20189227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20451373) 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, 18095 + ... + 19191.

It is an arithmetic number, because the mean of its divisors is an integer number (2597868).

Almost surely, 2^20451371 is an apocalyptic number.

20451371 is a deficient number, since it is larger than the sum of its proper divisors (331573).

20451371 is a wasteful number, since it uses less digits than its factorization.

20451371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20451371 is about 4522.3192058943. The cubic root of 20451371 is about 273.4686052952.

Adding to 20451371 its reverse (17315402), we get a palindrome (37766773).

The spelling of 20451371 in words is "twenty million, four hundred fifty-one thousand, three hundred seventy-one".