13658112020 has 144 divisors (see below), whose sum is σ = 34839882000. Its totient is φ = 4478810112.

The previous prime is 13658111993. The next prime is 13658112077. The reversal of 13658112020 is 2021185631.

It can be written as a sum of positive squares in 8 ways, for example, as 600936196 + 13057175824 = 24514^2 + 114268^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3095576 + ... + 3099984.

It is an arithmetic number, because the mean of its divisors is an integer number (241943625).

Almost surely, 2^13658112020 is an apocalyptic number.

13658112020 is a gapful number since it is divisible by the number (10) 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 13658112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17419941000).

13658112020 is an abundant number, since it is smaller than the sum of its proper divisors (21181769980).

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

13658112020 is a wasteful number, since it uses less digits than its factorization.

13658112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570 (or 4561 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 13658112020 its reverse (2021185631), we get a palindrome (15679297651).

The spelling of 13658112020 in words is "thirteen billion, six hundred fifty-eight million, one hundred twelve thousand, twenty".