20564311346502 has 48 divisors (see below), whose sum is σ = 52192908954432. Its totient is φ = 5341379569680.

The previous prime is 20564311346497. The next prime is 20564311346533.

20564311346502 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3179389368 + ... + 3179395835.

It is an arithmetic number, because the mean of its divisors is an integer number (1087352269884).

Almost surely, 2^{20564311346502} is an apocalyptic number.

20564311346502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20564311346502 is an abundant number, since it is smaller than the sum of its proper divisors (31628597607930).

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

20564311346502 is a wasteful number, since it uses less digits than its factorization.

20564311346502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6358785233 (or 6358785226 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 42.

The spelling of 20564311346502 in words is "twenty trillion, five hundred sixty-four billion, three hundred eleven million, three hundred forty-six thousand, five hundred two".