20612893987 has 16 divisors (see below), whose sum is σ = 23622363072. Its totient is φ = 17619684480.

The previous prime is 20612893979. The next prime is 20612893993. The reversal of 20612893987 is 78939821602.

It is a cyclic number.

It is not a de Polignac number, because 20612893987 - 2³ = 20612893979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20612893937) 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 15 ways as a sum of consecutive naturals, for example, 5819437 + ... + 5822977.

It is an arithmetic number, because the mean of its divisors is an integer number (1476397692).

Almost surely, 2^20612893987 is an apocalyptic number.

20612893987 is a deficient number, since it is larger than the sum of its proper divisors (3009469085).

20612893987 is a wasteful number, since it uses less digits than its factorization.

20612893987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5598.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 20612893987 in words is "twenty billion, six hundred twelve million, eight hundred ninety-three thousand, nine hundred eighty-seven".