20351887 has 8 divisors (see below), whose sum is σ = 20960496. Its totient is φ = 19746432.

The previous prime is 20351843. The next prime is 20351899. The reversal of 20351887 is 78815302.

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 20351887 - 2¹¹ = 20349839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20351827) 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, 20343 + ... + 21319.

It is an arithmetic number, because the mean of its divisors is an integer number (2620062).

Almost surely, 2^20351887 is an apocalyptic number.

20351887 is a deficient number, since it is larger than the sum of its proper divisors (608609).

20351887 is an equidigital number, since it uses as much as digits as its factorization.

20351887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1577.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 20351887 is about 4511.3065734884. The cubic root of 20351887 is about 273.0244625577.

The spelling of 20351887 in words is "twenty million, three hundred fifty-one thousand, eight hundred eighty-seven".