20405327320 has 32 divisors (see below), whose sum is σ = 52470842400. Its totient is φ = 6996112128.

The previous prime is 20405327317. The next prime is 20405327323. The reversal of 20405327320 is 2372350402.

It is an interprime number because it is at equal distance from previous prime (20405327317) and next prime (20405327323).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20405327323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36437805 + ... + 36438364.

It is an arithmetic number, because the mean of its divisors is an integer number (1639713825).

Almost surely, 2^20405327320 is an apocalyptic number.

20405327320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20405327320 is an abundant number, since it is smaller than the sum of its proper divisors (32065515080).

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

20405327320 is a wasteful number, since it uses less digits than its factorization.

20405327320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72876187 (or 72876183 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 28.

Adding to 20405327320 its reverse (2372350402), we get a palindrome (22777677722).

The spelling of 20405327320 in words is "twenty billion, four hundred five million, three hundred twenty-seven thousand, three hundred twenty".