20351645040546 has 12 divisors (see below), whose sum is σ = 44095230921222. Its totient is φ = 6783881680176.

The previous prime is 20351645040437. The next prime is 20351645040547. The reversal of 20351645040546 is 64504054615302.

20351645040546 is a `hidden beast` number, since 2 + 0 + 3 + 5 + 1 + 64 + 5 + 0 + 40 + 546 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19075624029225 + 1276021011321 = 4367565^2 + 1129611^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20351645040547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565323473331 + ... + 565323473366.

Almost surely, 2^{20351645040546} is an apocalyptic number.

20351645040546 is an abundant number, since it is smaller than the sum of its proper divisors (23743585880676).

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

20351645040546 is a wasteful number, since it uses less digits than its factorization.

20351645040546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130646946705 (or 1130646946702 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 45.

Adding to 20351645040546 its reverse (64504054615302), we get a palindrome (84855699655848).

The spelling of 20351645040546 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, forty thousand, five hundred forty-six".