20001243408 has 40 divisors (see below), whose sum is σ = 52250450400. Its totient is φ = 6592168704.

The previous prime is 20001243391. The next prime is 20001243473. The reversal of 20001243408 is 80434210002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2336698 + ... + 2345241.

It is an arithmetic number, because the mean of its divisors is an integer number (1306261260).

Almost surely, 2^20001243408 is an apocalyptic number.

It is an amenable number.

20001243408 is an abundant number, since it is smaller than the sum of its proper divisors (32249206992).

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

20001243408 is a wasteful number, since it uses less digits than its factorization.

20001243408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682039 (or 4682033 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The spelling of 20001243408 in words is "twenty billion, one million, two hundred forty-three thousand, four hundred eight".