20431187619 has 16 divisors (see below), whose sum is σ = 28242133920. Its totient is φ = 13122556160.

The previous prime is 20431187617. The next prime is 20431187641. The reversal of 20431187619 is 91678113402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20431187619 - 2¹ = 20431187617 is a prime.

It is a super-2 number, since 2×20431187619² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20431187617) 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, 214602 + ... + 294815.

It is an arithmetic number, because the mean of its divisors is an integer number (1765133370).

Almost surely, 2^20431187619 is an apocalyptic number.

20431187619 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20431187619 is a deficient number, since it is larger than the sum of its proper divisors (7810946301).

20431187619 is a wasteful number, since it uses less digits than its factorization.

20431187619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509910.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 20431187619 in words is "twenty billion, four hundred thirty-one million, one hundred eighty-seven thousand, six hundred nineteen".