20402131041193 has 12 divisors (see below), whose sum is σ = 22429992989124. Its totient is φ = 18543661690400.

The previous prime is 20402131041157. The next prime is 20402131041211. The reversal of 20402131041193 is 39114013120402.

It can be written as a sum of positive squares in 2 ways, for example, as 15107773944384 + 5294357096809 = 3886872^2 + 2300947^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20402131041193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402131042193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16351078 + ... + 17554543.

It is an arithmetic number, because the mean of its divisors is an integer number (1869166082427).

Almost surely, 2^{20402131041193} is an apocalyptic number.

It is an amenable number.

20402131041193 is a deficient number, since it is larger than the sum of its proper divisors (2027861947931).

20402131041193 is a wasteful number, since it uses less digits than its factorization.

20402131041193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33910616 (or 33910605 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

Adding to 20402131041193 its reverse (39114013120402), we get a palindrome (59516144161595).

The spelling of 20402131041193 in words is "twenty trillion, four hundred two billion, one hundred thirty-one million, forty-one thousand, one hundred ninety-three".