20013131243 has 64 divisors (see below), whose sum is σ = 25994772480. Its totient is φ = 15011568000.

The previous prime is 20013131231. The next prime is 20013131269. The reversal of 20013131243 is 34213131002.

It is a cyclic number.

It is not a de Polignac number, because 20013131243 - 2⁸ = 20013130987 is a prime.

It is a super-3 number, since 3×20013131243³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20013131213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17090048 + ... + 17091218.

It is an arithmetic number, because the mean of its divisors is an integer number (406168320).

Almost surely, 2^20013131243 is an apocalyptic number.

20013131243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20013131243 is a deficient number, since it is larger than the sum of its proper divisors (5981641237).

20013131243 is a wasteful number, since it uses less digits than its factorization.

20013131243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20013131243 its reverse (34213131002), we get a palindrome (54226262245).

The spelling of 20013131243 in words is "twenty billion, thirteen million, one hundred thirty-one thousand, two hundred forty-three".