20402001324 has 18 divisors (see below), whose sum is σ = 51571725660. Its totient is φ = 6800667096.

The previous prime is 20402001311. The next prime is 20402001331. The reversal of 20402001324 is 42310020402.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20402001297 and 20402001306.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283361094 + ... + 283361165.

It is an arithmetic number, because the mean of its divisors is an integer number (2865095870).

Almost surely, 2^20402001324 is an apocalyptic number.

It is an amenable number.

20402001324 is an abundant number, since it is smaller than the sum of its proper divisors (31169724336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20402001324 is a wasteful number, since it uses less digits than its factorization.

20402001324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566722269 (or 566722264 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20402001324 its reverse (42310020402), we get a palindrome (62712021726).

The spelling of 20402001324 in words is "twenty billion, four hundred two million, one thousand, three hundred twenty-four".