20346340553521 has 16 divisors (see below), whose sum is σ = 21803136246144. Its totient is φ = 18940493746944.

The previous prime is 20346340553449. The next prime is 20346340553551. The reversal of 20346340553521 is 12535504364302.

It is a de Polignac number, because none of the positive numbers 2^k-20346340553521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20346340553551) 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 15 ways as a sum of consecutive naturals, for example, 36860776 + ... + 37408681.

It is an arithmetic number, because the mean of its divisors is an integer number (1362696015384).

Almost surely, 2^{20346340553521} is an apocalyptic number.

It is an amenable number.

20346340553521 is a deficient number, since it is larger than the sum of its proper divisors (1456795692623).

20346340553521 is a wasteful number, since it uses less digits than its factorization.

20346340553521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74269800.

The product of its (nonzero) digits is 1296000, while the sum is 43.

The spelling of 20346340553521 in words is "twenty trillion, three hundred forty-six billion, three hundred forty million, five hundred fifty-three thousand, five hundred twenty-one".