20105527987 has 2 divisors, whose sum is σ = 20105527988. Its totient is φ = 20105527986.

The previous prime is 20105527951. The next prime is 20105528011. The reversal of 20105527987 is 78972550102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20105527987 - 2¹¹ = 20105525939 is a prime.

It is not a weakly prime, because it can be changed into another prime (20105527087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052763993 + 10052763994.

It is an arithmetic number, because the mean of its divisors is an integer number (10052763994).

Almost surely, 2^20105527987 is an apocalyptic number.

20105527987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20105527987 is an equidigital number, since it uses as much as digits as its factorization.

20105527987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 46.

The spelling of 20105527987 in words is "twenty billion, one hundred five million, five hundred twenty-seven thousand, nine hundred eighty-seven".