20434203747 has 8 divisors (see below), whose sum is σ = 30272894480. Its totient is φ = 13622802480.

The previous prime is 20434203709. The next prime is 20434203821. The reversal of 20434203747 is 74730243402.

It is not a de Polignac number, because 20434203747 - 2¹⁶ = 20434138211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434203047) 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, 378411154 + ... + 378411207.

It is an arithmetic number, because the mean of its divisors is an integer number (3784111810).

Almost surely, 2^20434203747 is an apocalyptic number.

20434203747 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20434203747 is a deficient number, since it is larger than the sum of its proper divisors (9838690733).

20434203747 is an equidigital number, since it uses as much as digits as its factorization.

20434203747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756822370 (or 756822364 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 36.

The spelling of 20434203747 in words is "twenty billion, four hundred thirty-four million, two hundred three thousand, seven hundred forty-seven".