20404511125240 has 64 divisors (see below), whose sum is σ = 50096570981760. Its totient is φ = 7417930235520.

The previous prime is 20404511125123. The next prime is 20404511125261. The reversal of 20404511125240 is 4252111540402.

It is a congruent 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, 4184394 + ... + 7636633.

It is an arithmetic number, because the mean of its divisors is an integer number (782758921590).

Almost surely, 2^{20404511125240} is an apocalyptic number.

20404511125240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404511125240 is an abundant number, since it is smaller than the sum of its proper divisors (29692059856520).

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

20404511125240 is a wasteful number, since it uses less digits than its factorization.

20404511125240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11824972 (or 11824968 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 20404511125240 its reverse (4252111540402), we get a palindrome (24656622665642).

The spelling of 20404511125240 in words is "twenty trillion, four hundred four billion, five hundred eleven million, one hundred twenty-five thousand, two hundred forty".