20842408480 has 48 divisors (see below), whose sum is σ = 49727755224. Its totient is φ = 8254412800.

The previous prime is 20842408361. The next prime is 20842408567. The reversal of 20842408480 is 8480424802.

It can be written as a sum of positive squares in 4 ways, for example, as 15578035344 + 5264373136 = 124812^2 + 72556^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 628717 + ... + 661036.

Almost surely, 2^20842408480 is an apocalyptic number.

20842408480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20842408480 is an abundant number, since it is smaller than the sum of its proper divisors (28885346744).

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

20842408480 is a wasteful number, since it uses less digits than its factorization.

20842408480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289869 (or 1289861 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 40.

The spelling of 20842408480 in words is "twenty billion, eight hundred forty-two million, four hundred eight thousand, four hundred eighty".