20351871 has 8 divisors (see below), whose sum is σ = 30150960. Its totient is φ = 13567896.

The previous prime is 20351843. The next prime is 20351899. The reversal of 20351871 is 17815302.

It is an interprime number because it is at equal distance from previous prime (20351843) and next prime (20351899).

It is not a de Polignac number, because 20351871 - 2¹⁴ = 20335487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 753773 = 20351871 / (2 + 0 + 3 + 5 + 1 + 8 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351801) 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, 376860 + ... + 376913.

It is an arithmetic number, because the mean of its divisors is an integer number (3768870).

Almost surely, 2^20351871 is an apocalyptic number.

20351871 is a deficient number, since it is larger than the sum of its proper divisors (9799089).

20351871 is an equidigital number, since it uses as much as digits as its factorization.

20351871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753782 (or 753776 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 20351871 is about 4511.3048001659. The cubic root of 20351871 is about 273.0243910100.

The spelling of 20351871 in words is "twenty million, three hundred fifty-one thousand, eight hundred seventy-one".