20645464274353 has 4 divisors (see below), whose sum is σ = 20651106656880. Its totient is φ = 20639821891828.

The previous prime is 20645464274333. The next prime is 20645464274419. The reversal of 20645464274353 is 35347246454602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20645464274353 - 2¹⁷ = 20645464143281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20645464274294 and 20645464274303.

It is not an unprimeable number, because it can be changed into a prime (20645464274333) 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, 2821185775 + ... + 2821193092.

It is an arithmetic number, because the mean of its divisors is an integer number (5162776664220).

Almost surely, 2^{20645464274353} is an apocalyptic number.

It is an amenable number.

20645464274353 is a deficient number, since it is larger than the sum of its proper divisors (5642382527).

20645464274353 is an equidigital number, since it uses as much as digits as its factorization.

20645464274353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642382526.

The product of its (nonzero) digits is 58060800, while the sum is 55.

The spelling of 20645464274353 in words is "twenty trillion, six hundred forty-five billion, four hundred sixty-four million, two hundred seventy-four thousand, three hundred fifty-three".