20394749401 has 4 divisors (see below), whose sum is σ = 21963576292. Its totient is φ = 18825922512.

The previous prime is 20394749399. The next prime is 20394749411. The reversal of 20394749401 is 10494749302.

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 2605592025 + 17789157376 = 51045^2 + 133376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20394749401 - 2¹ = 20394749399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20394749411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784413426 + ... + 784413451.

It is an arithmetic number, because the mean of its divisors is an integer number (5490894073).

Almost surely, 2^20394749401 is an apocalyptic number.

It is an amenable number.

20394749401 is a deficient number, since it is larger than the sum of its proper divisors (1568826891).

20394749401 is a wasteful number, since it uses less digits than its factorization.

20394749401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568826890.

The product of its (nonzero) digits is 217728, while the sum is 43.

Subtracting from 20394749401 its reverse (10494749302), we obtain a palindrome (9900000099).

The spelling of 20394749401 in words is "twenty billion, three hundred ninety-four million, seven hundred forty-nine thousand, four hundred one".