20503830 has 16 divisors (see below), whose sum is σ = 49209264. Its totient is φ = 5467680.

The previous prime is 20503829. The next prime is 20503843. The reversal of 20503830 is 3830502.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20503797 and 20503806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341701 + ... + 341760.

It is an arithmetic number, because the mean of its divisors is an integer number (3075579).

Almost surely, 2^20503830 is an apocalyptic number.

20503830 is an abundant number, since it is smaller than the sum of its proper divisors (28705434).

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

20503830 is a wasteful number, since it uses less digits than its factorization.

20503830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683471.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20503830 is about 4528.1155020604. The cubic root of 20503830 is about 273.7022268128.

The spelling of 20503830 in words is "twenty million, five hundred three thousand, eight hundred thirty".