20537221736473 has 16 divisors (see below), whose sum is σ = 22177975659840. Its totient is φ = 18905185151424.

The previous prime is 20537221736443. The next prime is 20537221736483. The reversal of 20537221736473 is 37463712273502.

It is a de Polignac number, because none of the positive numbers 2^k-20537221736473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20537221736473.

It is not an unprimeable number, because it can be changed into a prime (20537221736443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67049490 + ... + 67355092.

It is an arithmetic number, because the mean of its divisors is an integer number (1386123478740).

Almost surely, 2^{20537221736473} is an apocalyptic number.

It is an amenable number.

20537221736473 is a deficient number, since it is larger than the sum of its proper divisors (1640753923367).

20537221736473 is a wasteful number, since it uses less digits than its factorization.

20537221736473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319848.

The product of its (nonzero) digits is 8890560, while the sum is 52.

The spelling of 20537221736473 in words is "twenty trillion, five hundred thirty-seven billion, two hundred twenty-one million, seven hundred thirty-six thousand, four hundred seventy-three".