20402535125031 has 4 divisors (see below), whose sum is σ = 27203380166712. Its totient is φ = 13601690083352.

The previous prime is 20402535125029. The next prime is 20402535125039. The reversal of 20402535125031 is 13052153520402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20402535125031 - 2¹ = 20402535125029 is a prime.

It is a super-2 number, since 2×20402535125031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20402535124983 and 20402535125001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402535125039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400422520836 + ... + 3400422520841.

It is an arithmetic number, because the mean of its divisors is an integer number (6800845041678).

Almost surely, 2^{20402535125031} is an apocalyptic number.

20402535125031 is a deficient number, since it is larger than the sum of its proper divisors (6800845041681).

20402535125031 is an equidigital number, since it uses as much as digits as its factorization.

20402535125031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6800845041680.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 20402535125031 its reverse (13052153520402), we get a palindrome (33454688645433).

The spelling of 20402535125031 in words is "twenty trillion, four hundred two billion, five hundred thirty-five million, one hundred twenty-five thousand, thirty-one".