20290887 has 12 divisors (see below), whose sum is σ = 29933280. Its totient is φ = 13239168.

The previous prime is 20290873. The next prime is 20290889. The reversal of 20290887 is 78809202.

It is not a de Polignac number, because 20290887 - 2¹⁴ = 20274503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20290889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23562 + ... + 24407.

It is an arithmetic number, because the mean of its divisors is an integer number (2494440).

Almost surely, 2^20290887 is an apocalyptic number.

20290887 is a deficient number, since it is larger than the sum of its proper divisors (9642393).

20290887 is a wasteful number, since it uses less digits than its factorization.

20290887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48022 (or 48019 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 20290887 is about 4504.5407091068. The cubic root of 20290887 is about 272.7514140145.

The spelling of 20290887 in words is "twenty million, two hundred ninety thousand, eight hundred eighty-seven".