20356635620136 has 128 divisors (see below), whose sum is σ = 54176765328000. Its totient is φ = 6355743916032.

The previous prime is 20356635620099. The next prime is 20356635620161. The reversal of 20356635620136 is 63102653665302.

It is a happy number.

It is a super-2 number, since 2×20356635620136² (a number of 27 digits) contains 22 as substring.

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, 43868500 + ... + 44330108.

It is an arithmetic number, because the mean of its divisors is an integer number (423255979125).

Almost surely, 2^{20356635620136} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20356635620136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27088382664000).

20356635620136 is an abundant number, since it is smaller than the sum of its proper divisors (33820129707864).

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

20356635620136 is a wasteful number, since it uses less digits than its factorization.

20356635620136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462731 (or 462727 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 48.

The spelling of 20356635620136 in words is "twenty trillion, three hundred fifty-six billion, six hundred thirty-five million, six hundred twenty thousand, one hundred thirty-six".