20400213423 has 8 divisors (see below), whose sum is σ = 28382905728. Its totient is φ = 13008831704.

The previous prime is 20400213391. The next prime is 20400213433. The reversal of 20400213423 is 32431200402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20400213423 - 2⁵ = 20400213391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400213423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400213433) 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 7 ways as a sum of consecutive naturals, for example, 147827565 + ... + 147827702.

It is an arithmetic number, because the mean of its divisors is an integer number (3547863216).

Almost surely, 2^20400213423 is an apocalyptic number.

20400213423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20400213423 is a deficient number, since it is larger than the sum of its proper divisors (7982692305).

20400213423 is a wasteful number, since it uses less digits than its factorization.

20400213423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295655293.

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

Adding to 20400213423 its reverse (32431200402), we get a palindrome (52831413825).

The spelling of 20400213423 in words is "twenty billion, four hundred million, two hundred thirteen thousand, four hundred twenty-three".