20880111587 has 2 divisors, whose sum is σ = 20880111588. Its totient is φ = 20880111586.

The previous prime is 20880111559. The next prime is 20880111599. The reversal of 20880111587 is 78511108802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20880111587 - 2⁶ = 20880111523 is a prime.

It is not a weakly prime, because it can be changed into another prime (20880911587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440055793 + 10440055794.

It is an arithmetic number, because the mean of its divisors is an integer number (10440055794).

Almost surely, 2^20880111587 is an apocalyptic number.

20880111587 is a deficient number, since it is larger than the sum of its proper divisors (1).

20880111587 is an equidigital number, since it uses as much as digits as its factorization.

20880111587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 41.

The spelling of 20880111587 in words is "twenty billion, eight hundred eighty million, one hundred eleven thousand, five hundred eighty-seven".