20252431987 has 8 divisors (see below), whose sum is σ = 21449140160. Its totient is φ = 19068802920.

The previous prime is 20252431973. The next prime is 20252432003. The reversal of 20252431987 is 78913425202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20252431987 - 2³¹ = 18104948339 is a prime.

It is a super-2 number, since 2×20252431987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20252431957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3266589 + ... + 3272782.

It is an arithmetic number, because the mean of its divisors is an integer number (2681142520).

Almost surely, 2^20252431987 is an apocalyptic number.

20252431987 is a deficient number, since it is larger than the sum of its proper divisors (1196708173).

20252431987 is a wasteful number, since it uses less digits than its factorization.

20252431987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539553.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 20252431987 in words is "twenty billion, two hundred fifty-two million, four hundred thirty-one thousand, nine hundred eighty-seven".