20445140467 has 4 divisors (see below), whose sum is σ = 20517899256. Its totient is φ = 20372381680.

The previous prime is 20445140407. The next prime is 20445140477. The reversal of 20445140467 is 76404154402.

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

It is a cyclic number.

It is not a de Polignac number, because 20445140467 - 2²⁷ = 20310922739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445140407) 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, 36378973 + ... + 36379534.

It is an arithmetic number, because the mean of its divisors is an integer number (5129474814).

Almost surely, 2^20445140467 is an apocalyptic number.

20445140467 is a deficient number, since it is larger than the sum of its proper divisors (72758789).

20445140467 is an equidigital number, since it uses as much as digits as its factorization.

20445140467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72758788.

The product of its (nonzero) digits is 107520, while the sum is 37.

Adding to 20445140467 its reverse (76404154402), we get a palindrome (96849294869).

The spelling of 20445140467 in words is "twenty billion, four hundred forty-five million, one hundred forty thousand, four hundred sixty-seven".