20480047840 has 72 divisors (see below), whose sum is σ = 56283581592. Its totient is φ = 7021728000.

The previous prime is 20480047817. The next prime is 20480047843. The reversal of 20480047840 is 4874008402.

It is a self number, because there is not a number n which added to its sum of digits gives 20480047840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20480047843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1298286 + ... + 1313965.

It is an arithmetic number, because the mean of its divisors is an integer number (781716411).

Almost surely, 2^20480047840 is an apocalyptic number.

20480047840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20480047840 is an abundant number, since it is smaller than the sum of its proper divisors (35803533752).

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

20480047840 is a wasteful number, since it uses less digits than its factorization.

20480047840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612280 (or 2612265 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 37.

The spelling of 20480047840 in words is "twenty billion, four hundred eighty million, forty-seven thousand, eight hundred forty".