20401320394 has 32 divisors (see below), whose sum is σ = 37855230336. Its totient is φ = 8029869120.

The previous prime is 20401320389. The next prime is 20401320397. The reversal of 20401320394 is 49302310402.

It is not an unprimeable number, because it can be changed into a prime (20401320397) 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 15 ways as a sum of consecutive naturals, for example, 248652 + ... + 320359.

It is an arithmetic number, because the mean of its divisors is an integer number (1182975948).

Almost surely, 2^20401320394 is an apocalyptic number.

20401320394 is a deficient number, since it is larger than the sum of its proper divisors (17453909942).

20401320394 is a wasteful number, since it uses less digits than its factorization.

20401320394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569230.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 20401320394 its reverse (49302310402), we get a palindrome (69703630796).

The spelling of 20401320394 in words is "twenty billion, four hundred one million, three hundred twenty thousand, three hundred ninety-four".