20420023299991 has 4 divisors (see below), whose sum is σ = 23337169485712. Its totient is φ = 17502877114272.

The previous prime is 20420023299989. The next prime is 20420023300049. The reversal of 20420023299991 is 19999232002402.

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 20420023299991 - 2¹ = 20420023299989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420023299491) 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, 1458573092850 + ... + 1458573092863.

It is an arithmetic number, because the mean of its divisors is an integer number (5834292371428).

Almost surely, 2^{20420023299991} is an apocalyptic number.

20420023299991 is a deficient number, since it is larger than the sum of its proper divisors (2917146185721).

20420023299991 is an equidigital number, since it uses as much as digits as its factorization.

20420023299991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2917146185720.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 20420023299991 in words is "twenty trillion, four hundred twenty billion, twenty-three million, two hundred ninety-nine thousand, nine hundred ninety-one".