20403296240 has 40 divisors (see below), whose sum is σ = 47443622640. Its totient is φ = 8160293376.

The previous prime is 20403296239. The next prime is 20403296269. The reversal of 20403296240 is 4269230402.

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

It is a junction number, because it is equal to n+sod(n) for n = 20403296197 and 20403296206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173692 + ... + 1190948.

It is an arithmetic number, because the mean of its divisors is an integer number (1186090566).

Almost surely, 2^20403296240 is an apocalyptic number.

20403296240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403296240 is an abundant number, since it is smaller than the sum of its proper divisors (27040326400).

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

20403296240 is a wasteful number, since it uses less digits than its factorization.

20403296240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32049 (or 32043 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 20403296240 in words is "twenty billion, four hundred three million, two hundred ninety-six thousand, two hundred forty".