20746424840 has 128 divisors (see below), whose sum is σ = 49065782400. Its totient is φ = 7884656640.

The previous prime is 20746424807. The next prime is 20746424851. The reversal of 20746424840 is 4842464702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21365555 + ... + 21366525.

It is an arithmetic number, because the mean of its divisors is an integer number (383326425).

Almost surely, 2^20746424840 is an apocalyptic number.

20746424840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20746424840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24532891200).

20746424840 is an abundant number, since it is smaller than the sum of its proper divisors (28319357560).

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

20746424840 is a wasteful number, since it uses less digits than its factorization.

20746424840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287 (or 1283 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 41.

The spelling of 20746424840 in words is "twenty billion, seven hundred forty-six million, four hundred twenty-four thousand, eight hundred forty".