20000985505377 has 32 divisors (see below), whose sum is σ = 27842041941120. Its totient is φ = 12760641653760.

The previous prime is 20000985505339. The next prime is 20000985505379. The reversal of 20000985505377 is 77350558900002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20000985505377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20000985505379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4443102 + ... + 7729367.

It is an arithmetic number, because the mean of its divisors is an integer number (870063810660).

Almost surely, 2^{20000985505377} is an apocalyptic number.

It is an amenable number.

20000985505377 is a deficient number, since it is larger than the sum of its proper divisors (7841056435743).

20000985505377 is a wasteful number, since it uses less digits than its factorization.

20000985505377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12172753.

The product of its (nonzero) digits is 2646000, while the sum is 51.

The spelling of 20000985505377 in words is "twenty trillion, nine hundred eighty-five million, five hundred five thousand, three hundred seventy-seven".