20420333643 has 8 divisors (see below), whose sum is σ = 27610592256. Its totient is φ = 13421815400.

The previous prime is 20420333627. The next prime is 20420333651. The reversal of 20420333643 is 34633302402.

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 20420333643 - 2⁴ = 20420333627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20420333643.

It is not an unprimeable number, because it can be changed into a prime (20420333603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47934843 + ... + 47935268.

It is an arithmetic number, because the mean of its divisors is an integer number (3451324032).

Almost surely, 2^20420333643 is an apocalyptic number.

20420333643 is a deficient number, since it is larger than the sum of its proper divisors (7190258613).

20420333643 is an equidigital number, since it uses as much as digits as its factorization.

20420333643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95870185.

The product of its (nonzero) digits is 31104, while the sum is 30.

The spelling of 20420333643 in words is "twenty billion, four hundred twenty million, three hundred thirty-three thousand, six hundred forty-three".