20503840 has 48 divisors (see below), whose sum is σ = 55363392. Its totient is φ = 7029504.

The previous prime is 20503829. The next prime is 20503843. The reversal of 20503840 is 4830502.

It is not an unprimeable number, because it can be changed into a prime (20503843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8034 + ... + 10273.

It is an arithmetic number, because the mean of its divisors is an integer number (1153404).

Almost surely, 2^20503840 is an apocalyptic number.

20503840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20503840 is an abundant number, since it is smaller than the sum of its proper divisors (34859552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20503840 is a wasteful number, since it uses less digits than its factorization.

20503840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18329 (or 18321 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20503840 is about 4528.1166062724. The cubic root of 20503840 is about 273.7022713089.

The spelling of 20503840 in words is "twenty million, five hundred three thousand, eight hundred forty".