20665423401 has 8 divisors (see below), whose sum is σ = 31490169024. Its totient is φ = 11808813360.

The previous prime is 20665423393. The next prime is 20665423501. The reversal of 20665423401 is 10432456602.

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

It is not a de Polignac number, because 20665423401 - 2³ = 20665423393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20665423001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492033870 + ... + 492033911.

It is an arithmetic number, because the mean of its divisors is an integer number (3936271128).

Almost surely, 2^20665423401 is an apocalyptic number.

20665423401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20665423401 is a deficient number, since it is larger than the sum of its proper divisors (10824745623).

20665423401 is an equidigital number, since it uses as much as digits as its factorization.

20665423401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984067791.

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 20665423401 in words is "twenty billion, six hundred sixty-five million, four hundred twenty-three thousand, four hundred one".