20404534240 has 48 divisors (see below), whose sum is σ = 51041349072. Its totient is φ = 7681705984.

The previous prime is 20404534237. The next prime is 20404534243. The reversal of 20404534240 is 4243540402.

It is an interprime number because it is at equal distance from previous prime (20404534237) and next prime (20404534243).

It is a junction number, because it is equal to n+sod(n) for n = 20404534199 and 20404534208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404534243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3748114 + ... + 3753553.

It is an arithmetic number, because the mean of its divisors is an integer number (1063361439).

Almost surely, 2^20404534240 is an apocalyptic number.

20404534240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404534240 is an abundant number, since it is smaller than the sum of its proper divisors (30636814832).

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

20404534240 is a wasteful number, since it uses less digits than its factorization.

20404534240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7501699 (or 7501691 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 28.

The spelling of 20404534240 in words is "twenty billion, four hundred four million, five hundred thirty-four thousand, two hundred forty".