20001245131 has 16 divisors (see below), whose sum is σ = 23174452224. Its totient is φ = 16907733504.

The previous prime is 20001245123. The next prime is 20001245171. The reversal of 20001245131 is 13154210002.

It is a cyclic number.

It is not a de Polignac number, because 20001245131 - 2³ = 20001245123 is a prime.

It is a super-2 number, since 2×20001245131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20001245099 and 20001245108.

It is not an unprimeable number, because it can be changed into a prime (20001245171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305406 + ... + 365068.

It is an arithmetic number, because the mean of its divisors is an integer number (1448403264).

Almost surely, 2^20001245131 is an apocalyptic number.

20001245131 is a deficient number, since it is larger than the sum of its proper divisors (3173207093).

20001245131 is an equidigital number, since it uses as much as digits as its factorization.

20001245131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60330.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 20001245131 its reverse (13154210002), we get a palindrome (33155455133).

The spelling of 20001245131 in words is "twenty billion, one million, two hundred forty-five thousand, one hundred thirty-one".