20503040 has 40 divisors (see below), whose sum is σ = 49165380. Its totient is φ = 8200192.

The previous prime is 20503027. The next prime is 20503073. The reversal of 20503040 is 4030502.

It can be written as a sum of positive squares in 2 ways, for example, as 20502784 + 256 = 4528^2 + 16^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445 + ... + 6564.

Almost surely, 2^20503040 is an apocalyptic number.

20503040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20503040 is an abundant number, since it is smaller than the sum of its proper divisors (28662340).

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

20503040 is an frugal number, since it uses more digits than its factorization.

20503040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8032 (or 8016 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20503040 is about 4528.0282684630. The cubic root of 20503040 is about 273.6987115746.

Adding to 20503040 its reverse (4030502), we get a palindrome (24533542).

The spelling of 20503040 in words is "twenty million, five hundred three thousand, forty".