20936858517550 has 12 divisors (see below), whose sum is σ = 38942556842736. Its totient is φ = 8374743407000.

The previous prime is 20936858517541. The next prime is 20936858517611. The reversal of 20936858517550 is 5571585863902.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 209368585126 + ... + 209368585225.

It is an arithmetic number, because the mean of its divisors is an integer number (3245213070228).

Almost surely, 2^{20936858517550} is an apocalyptic number.

20936858517550 is a deficient number, since it is larger than the sum of its proper divisors (18005698325186).

20936858517550 is a wasteful number, since it uses less digits than its factorization.

20936858517550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418737170363 (or 418737170358 counting only the distinct ones).

The product of its (nonzero) digits is 90720000, while the sum is 64.

The spelling of 20936858517550 in words is "twenty trillion, nine hundred thirty-six billion, eight hundred fifty-eight million, five hundred seventeen thousand, five hundred fifty".