20426661511545 has 16 divisors (see below), whose sum is σ = 33299312352192. Its totient is φ = 10688668161600.

The previous prime is 20426661511469. The next prime is 20426661511567. The reversal of 20426661511545 is 54511516662402.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20426661511545 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20426661511494 and 20426661511503.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12846956131 + ... + 12846957720.

It is an arithmetic number, because the mean of its divisors is an integer number (2081207022012).

Almost surely, 2^{20426661511545} is an apocalyptic number.

It is an amenable number.

20426661511545 is a deficient number, since it is larger than the sum of its proper divisors (12872650840647).

20426661511545 is a wasteful number, since it uses less digits than its factorization.

20426661511545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25693913912.

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 20426661511545 in words is "twenty trillion, four hundred twenty-six billion, six hundred sixty-one million, five hundred eleven thousand, five hundred forty-five".