20503887 has 8 divisors (see below), whose sum is σ = 28946736. Its totient is φ = 12865152.

The previous prime is 20503871. The next prime is 20503937. The reversal of 20503887 is 78830502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20503887 - 2⁴ = 20503871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503807) 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, 200968 + ... + 201069.

It is an arithmetic number, because the mean of its divisors is an integer number (3618342).

Almost surely, 2^20503887 is an apocalyptic number.

20503887 is a deficient number, since it is larger than the sum of its proper divisors (8442849).

20503887 is a wasteful number, since it uses less digits than its factorization.

20503887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402057.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20503887 is about 4528.1217960651. The cubic root of 20503887 is about 273.7024804404.

The spelling of 20503887 in words is "twenty million, five hundred three thousand, eight hundred eighty-seven".