20787166145 has 8 divisors (see below), whose sum is σ = 25043981760. Its totient is φ = 16563478000.

The previous prime is 20787166139. The next prime is 20787166193. The reversal of 20787166145 is 54166178702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20787166145 - 2⁴ = 20787166129 is a prime.

It is a super-2 number, since 2×20787166145² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20787166145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8280485 + ... + 8282994.

It is an arithmetic number, because the mean of its divisors is an integer number (3130497720).

Almost surely, 2^20787166145 is an apocalyptic number.

It is an amenable number.

20787166145 is a deficient number, since it is larger than the sum of its proper divisors (4256815615).

20787166145 is a wasteful number, since it uses less digits than its factorization.

20787166145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563735.

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 20787166145 in words is "twenty billion, seven hundred eighty-seven million, one hundred sixty-six thousand, one hundred forty-five".