20155606536 has 144 divisors (see below), whose sum is σ = 56391040080. Its totient is φ = 6000508800.

The previous prime is 20155606511. The next prime is 20155606547. The reversal of 20155606536 is 63560655102.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 20155606494 and 20155606503.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3895231 + ... + 3900401.

It is an arithmetic number, because the mean of its divisors is an integer number (391604445).

Almost surely, 2^20155606536 is an apocalyptic number.

20155606536 is a gapful number since it is divisible by the number (26) 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 20155606536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28195520040).

20155606536 is an abundant number, since it is smaller than the sum of its proper divisors (36235433544).

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

20155606536 is a wasteful number, since it uses less digits than its factorization.

20155606536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5268 (or 5220 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 20155606536 in words is "twenty billion, one hundred fifty-five million, six hundred six thousand, five hundred thirty-six".