20402540407712 has 96 divisors (see below), whose sum is σ = 41649792770880. Its totient is φ = 9826477373440.

The previous prime is 20402540407679. The next prime is 20402540407729. The reversal of 20402540407712 is 21770404520402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1374548963 + ... + 1374563805.

It is an arithmetic number, because the mean of its divisors is an integer number (433852008030).

Almost surely, 2^{20402540407712} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402540407712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20824896385440).

20402540407712 is an abundant number, since it is smaller than the sum of its proper divisors (21247252363168).

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

20402540407712 is a wasteful number, since it uses less digits than its factorization.

20402540407712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18246 (or 18238 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 38.

The spelling of 20402540407712 in words is "twenty trillion, four hundred two billion, five hundred forty million, four hundred seven thousand, seven hundred twelve".