20503955 has 16 divisors (see below), whose sum is σ = 26158464. Its totient is φ = 15375360.

The previous prime is 20503949. The next prime is 20503961. The reversal of 20503955 is 55930502.

It is an interprime number because it is at equal distance from previous prime (20503949) and next prime (20503961).

It is not a de Polignac number, because 20503955 - 2⁸ = 20503699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39095 + ... + 39615.

It is an arithmetic number, because the mean of its divisors is an integer number (1634904).

Almost surely, 2^20503955 is an apocalyptic number.

20503955 is a deficient number, since it is larger than the sum of its proper divisors (5654509).

20503955 is a wasteful number, since it uses less digits than its factorization.

20503955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006.

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 20503955 is about 4528.1293046908. The cubic root of 20503955 is about 273.7027830131.

The spelling of 20503955 in words is "twenty million, five hundred three thousand, nine hundred fifty-five".