20823167907 has 18 divisors (see below), whose sum is σ = 31195275748. Its totient is φ = 13880612304.

The previous prime is 20823167899. The next prime is 20823167923. The reversal of 20823167907 is 70976132802.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20823167907 - 2³ = 20823167899 is a prime.

It is a super-2 number, since 2×20823167907² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20823167977) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2244823 + ... + 2254079.

Almost surely, 2^20823167907 is an apocalyptic number.

20823167907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20823167907 is a deficient number, since it is larger than the sum of its proper divisors (10372107841).

20823167907 is an frugal number, since it uses more digits than its factorization.

20823167907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18529 (or 9260 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The spelling of 20823167907 in words is "twenty billion, eight hundred twenty-three million, one hundred sixty-seven thousand, nine hundred seven".