20401320423 has 16 divisors (see below), whose sum is σ = 29739603456. Its totient is φ = 12337371840.

The previous prime is 20401320419. The next prime is 20401320431. The reversal of 20401320423 is 32402310402.

It is not a de Polignac number, because 20401320423 - 2² = 20401320419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20401320423.

It is a congruent 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, 661311 + ... + 691472.

It is an arithmetic number, because the mean of its divisors is an integer number (1858725216).

Almost surely, 2^20401320423 is an apocalyptic number.

20401320423 is a deficient number, since it is larger than the sum of its proper divisors (9338283033).

20401320423 is a wasteful number, since it uses less digits than its factorization.

20401320423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353254.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20401320423 its reverse (32402310402), we get a palindrome (52803630825).

The spelling of 20401320423 in words is "twenty billion, four hundred one million, three hundred twenty thousand, four hundred twenty-three".