20125643133640 has 32 divisors (see below), whose sum is σ = 49399305874560. Its totient is φ = 7318415684800.

The previous prime is 20125643133601. The next prime is 20125643133691. The reversal of 20125643133640 is 4633134652102.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 20125643133593 and 20125643133602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22870048576 + ... + 22870049455.

It is an arithmetic number, because the mean of its divisors is an integer number (1543728308580).

Almost surely, 2^{20125643133640} is an apocalyptic number.

20125643133640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20125643133640 is an abundant number, since it is smaller than the sum of its proper divisors (29273662740920).

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

20125643133640 is a wasteful number, since it uses less digits than its factorization.

20125643133640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45740098053 (or 45740098049 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

Adding to 20125643133640 its reverse (4633134652102), we get a palindrome (24758777785742).

The spelling of 20125643133640 in words is "twenty trillion, one hundred twenty-five billion, six hundred forty-three million, one hundred thirty-three thousand, six hundred forty".