20167570990807 has 4 divisors (see below), whose sum is σ = 20185955286336. Its totient is φ = 20149186695280.

The previous prime is 20167570990783. The next prime is 20167570990829. The reversal of 20167570990807 is 70809907576102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20167570990807 is a prime.

It is a super-2 number, since 2×20167570990807² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20167570990207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9192146119 + ... + 9192148312.

It is an arithmetic number, because the mean of its divisors is an integer number (5046488821584).

Almost surely, 2^{20167570990807} is an apocalyptic number.

20167570990807 is a deficient number, since it is larger than the sum of its proper divisors (18384295529).

20167570990807 is a wasteful number, since it uses less digits than its factorization.

20167570990807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18384295528.

The product of its (nonzero) digits is 13335840, while the sum is 61.

The spelling of 20167570990807 in words is "twenty trillion, one hundred sixty-seven billion, five hundred seventy million, nine hundred ninety thousand, eight hundred seven".