20315655747 has 12 divisors (see below), whose sum is σ = 29349290880. Its totient is φ = 13541714448.

The previous prime is 20315655743. The next prime is 20315655761. The reversal of 20315655747 is 74755651302.

It is a happy number.

20315655747 is a `hidden beast` number, since 2 + 0 + 3 + 1 + 56 + 557 + 47 = 666.

It is not a de Polignac number, because 20315655747 - 2² = 20315655743 is a prime.

It is a super-2 number, since 2×20315655747² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20315655743) 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 11 ways as a sum of consecutive naturals, for example, 107508 + ... + 228449.

It is an arithmetic number, because the mean of its divisors is an integer number (2445774240).

Almost surely, 2^20315655747 is an apocalyptic number.

20315655747 is a deficient number, since it is larger than the sum of its proper divisors (9033635133).

20315655747 is a wasteful number, since it uses less digits than its factorization.

20315655747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342682 (or 342679 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 45.

The spelling of 20315655747 in words is "twenty billion, three hundred fifteen million, six hundred fifty-five thousand, seven hundred forty-seven".