20324366551 has 4 divisors (see below), whose sum is σ = 20668847400. Its totient is φ = 19979885704.

The previous prime is 20324366549. The next prime is 20324366561. The reversal of 20324366551 is 15566342302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20324366551 - 2¹ = 20324366549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20324366551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324366521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172240336 + ... + 172240453.

It is an arithmetic number, because the mean of its divisors is an integer number (5167211850).

Almost surely, 2^20324366551 is an apocalyptic number.

20324366551 is a deficient number, since it is larger than the sum of its proper divisors (344480849).

20324366551 is an equidigital number, since it uses as much as digits as its factorization.

20324366551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344480848.

The product of its (nonzero) digits is 129600, while the sum is 37.

The spelling of 20324366551 in words is "twenty billion, three hundred twenty-four million, three hundred sixty-six thousand, five hundred fifty-one".