20420400001 has 4 divisors (see below), whose sum is σ = 20423395332. Its totient is φ = 20417404672.

The previous prime is 20420399953. The next prime is 20420400023. The reversal of 20420400001 is 10000402402.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1354313601 + 19066086400 = 36801^2 + 138080^2 .

It is a cyclic number.

It is not a de Polignac number, because 20420400001 - 2⁷ = 20420399873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420400061) 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 3 ways as a sum of consecutive naturals, for example, 1487416 + ... + 1501081.

It is an arithmetic number, because the mean of its divisors is an integer number (5105848833).

Almost surely, 2^20420400001 is an apocalyptic number.

It is an amenable number.

20420400001 is a deficient number, since it is larger than the sum of its proper divisors (2995331).

20420400001 is an equidigital number, since it uses as much as digits as its factorization.

20420400001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995330.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20420400001 its reverse (10000402402), we get a palindrome (30420802403).

The spelling of 20420400001 in words is "twenty billion, four hundred twenty million, four hundred thousand, one".