20004172645 has 8 divisors (see below), whose sum is σ = 24005782656. Its totient is φ = 16002821136.

The previous prime is 20004172633. The next prime is 20004172673. The reversal of 20004172645 is 54627140002.

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

It is a cyclic number.

It is not a de Polignac number, because 20004172645 - 2²¹ = 20002075493 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 217984 + ... + 295846.

It is an arithmetic number, because the mean of its divisors is an integer number (3000722832).

Almost surely, 2^20004172645 is an apocalyptic number.

It is an amenable number.

20004172645 is a deficient number, since it is larger than the sum of its proper divisors (4001610011).

20004172645 is an equidigital number, since it uses as much as digits as its factorization.

20004172645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129251.

The product of its (nonzero) digits is 13440, while the sum is 31.

The spelling of 20004172645 in words is "twenty billion, four million, one hundred seventy-two thousand, six hundred forty-five".