20297727581766 has 36 divisors (see below), whose sum is σ = 43124290404012. Its totient is φ = 6367855678464.

The previous prime is 20297727581723. The next prime is 20297727581819. The reversal of 20297727581766 is 66718572779202.

It is a self number, because there is not a number n which added to its sum of digits gives 20297727581766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 187552566 + ... + 187660758.

It is an arithmetic number, because the mean of its divisors is an integer number (1197896955667).

Almost surely, 2^{20297727581766} is an apocalyptic number.

20297727581766 is an abundant number, since it is smaller than the sum of its proper divisors (22826562822246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20297727581766 is an frugal number, since it uses more digits than its factorization.

20297727581766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216425 (or 108215 counting only the distinct ones).

The product of its (nonzero) digits is 248935680, while the sum is 69.

The spelling of 20297727581766 in words is "twenty trillion, two hundred ninety-seven billion, seven hundred twenty-seven million, five hundred eighty-one thousand, seven hundred sixty-six".