20401320403 has 16 divisors (see below), whose sum is σ = 21478867200. Its totient is φ = 19351376800.

The previous prime is 20401320397. The next prime is 20401320419. The reversal of 20401320403 is 30402310402.

It is a cyclic number.

It is not a de Polignac number, because 20401320403 - 2⁹ = 20401319891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20401320463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407178 + ... + 454528.

It is an arithmetic number, because the mean of its divisors is an integer number (1342429200).

Almost surely, 2^20401320403 is an apocalyptic number.

20401320403 is a deficient number, since it is larger than the sum of its proper divisors (1077546797).

20401320403 is a wasteful number, since it uses less digits than its factorization.

20401320403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47642.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20401320403 its reverse (30402310402), we get a palindrome (50803630805).

The spelling of 20401320403 in words is "twenty billion, four hundred one million, three hundred twenty thousand, four hundred three".