20635664343520 has 192 divisors, whose sum is σ = 50153174507520. Its totient is φ = 8019736363008.

The previous prime is 20635664343509. The next prime is 20635664343533. The reversal of 20635664343520 is 2534346653602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 695186599 + ... + 695216281.

It is an arithmetic number, because the mean of its divisors is an integer number (261214450560).

Almost surely, 2^{20635664343520} is an apocalyptic number.

20635664343520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20635664343520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25076587253760).

20635664343520 is an abundant number, since it is smaller than the sum of its proper divisors (29517510164000).

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

20635664343520 is a wasteful number, since it uses less digits than its factorization.

20635664343520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30417 (or 30409 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 49.

The spelling of 20635664343520 in words is "twenty trillion, six hundred thirty-five billion, six hundred sixty-four million, three hundred forty-three thousand, five hundred twenty".