20117742353140 has 12 divisors (see below), whose sum is σ = 42247258941636. Its totient is φ = 8047096941248.

The previous prime is 20117742353131. The next prime is 20117742353143. The reversal of 20117742353140 is 4135324771102.

It can be written as a sum of positive squares in 2 ways, for example, as 2863588221796 + 17254154131344 = 1692214^2 + 4153812^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20117742353093 and 20117742353102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117742353143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502943558809 + ... + 502943558848.

It is an arithmetic number, because the mean of its divisors is an integer number (3520604911803).

Almost surely, 2^{20117742353140} is an apocalyptic number.

20117742353140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20117742353140 is an abundant number, since it is smaller than the sum of its proper divisors (22129516588496).

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

20117742353140 is a wasteful number, since it uses less digits than its factorization.

20117742353140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005887117666 (or 1005887117664 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 20117742353140 in words is "twenty trillion, one hundred seventeen billion, seven hundred forty-two million, three hundred fifty-three thousand, one hundred forty".