20438887 has 4 divisors (see below), whose sum is σ = 23358736. Its totient is φ = 17519040.

The previous prime is 20438863. The next prime is 20438909. The reversal of 20438887 is 78883402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20438887 - 2¹⁵ = 20406119 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 (20438087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1459914 + ... + 1459927.

It is an arithmetic number, because the mean of its divisors is an integer number (5839684).

Almost surely, 2^20438887 is an apocalyptic number.

20438887 is a deficient number, since it is larger than the sum of its proper divisors (2919849).

20438887 is an equidigital number, since it uses as much as digits as its factorization.

20438887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919848.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 20438887 is about 4520.9387299542. The cubic root of 20438887 is about 273.4129500702.

The spelling of 20438887 in words is "twenty million, four hundred thirty-eight thousand, eight hundred eighty-seven".