20187667104428 has 12 divisors (see below), whose sum is σ = 36283239525792. Its totient is φ = 9821027239920.

The previous prime is 20187667104389. The next prime is 20187667104457. The reversal of 20187667104428 is 82440176678102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68201577908 + ... + 68201578203.

It is an arithmetic number, because the mean of its divisors is an integer number (3023603293816).

Almost surely, 2^{20187667104428} is an apocalyptic number.

It is an amenable number.

20187667104428 is a deficient number, since it is larger than the sum of its proper divisors (16095572421364).

20187667104428 is a wasteful number, since it uses less digits than its factorization.

20187667104428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136403156152 (or 136403156150 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 56.

The spelling of 20187667104428 in words is "twenty trillion, one hundred eighty-seven billion, six hundred sixty-seven million, one hundred four thousand, four hundred twenty-eight".