20312155651 has 8 divisors (see below), whose sum is σ = 20351755008. Its totient is φ = 20272581000.

The previous prime is 20312155649. The next prime is 20312155687. The reversal of 20312155651 is 15655121302.

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 20312155651 - 2¹ = 20312155649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312155691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2767056 + ... + 2774386.

It is an arithmetic number, because the mean of its divisors is an integer number (2543969376).

Almost surely, 2^20312155651 is an apocalyptic number.

20312155651 is a deficient number, since it is larger than the sum of its proper divisors (39599357).

20312155651 is an equidigital number, since it uses as much as digits as its factorization.

20312155651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12353.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 20312155651 its reverse (15655121302), we get a palindrome (35967276953).

The spelling of 20312155651 in words is "twenty billion, three hundred twelve million, one hundred fifty-five thousand, six hundred fifty-one".