20113147987 has 2 divisors, whose sum is σ = 20113147988. Its totient is φ = 20113147986.

The previous prime is 20113147973. The next prime is 20113147997. The reversal of 20113147987 is 78974131102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20113147987 - 2¹⁵ = 20113115219 is a prime.

It is not a weakly prime, because it can be changed into another prime (20113147907) 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 as a sum of consecutive naturals, namely, 10056573993 + 10056573994.

It is an arithmetic number, because the mean of its divisors is an integer number (10056573994).

Almost surely, 2^20113147987 is an apocalyptic number.

20113147987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113147987 is an equidigital number, since it uses as much as digits as its factorization.

20113147987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

It can be divided in two parts, 20113 and 147987, that added together give a square (168100 = 410²).

The spelling of 20113147987 in words is "twenty billion, one hundred thirteen million, one hundred forty-seven thousand, nine hundred eighty-seven".