20351645106240 has 112 divisors (see below), whose sum is σ = 73847397981312. Its totient is φ = 4651804594176.

The previous prime is 20351645106229. The next prime is 20351645106241. The reversal of 20351645106240 is 4260154615302.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (20351645106241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514252589 + ... + 1514266028.

Almost surely, 2^{20351645106240} is an apocalyptic number.

20351645106240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20351645106240 is an abundant number, since it is smaller than the sum of its proper divisors (53495752875072).

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

20351645106240 is a wasteful number, since it uses less digits than its factorization.

20351645106240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028518644 (or 3028518634 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The spelling of 20351645106240 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, one hundred six thousand, two hundred forty".