13800020 has 24 divisors (see below), whose sum is σ = 31209864. Its totient is φ = 5095296.

The previous prime is 13800019. The next prime is 13800049. The reversal of 13800020 is 2000831.

It can be written as a sum of positive squares in 4 ways, for example, as 521284 + 13278736 = 722^2 + 3644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13799968 and 13800004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26279 + ... + 26798.

It is an arithmetic number, because the mean of its divisors is an integer number (1300411).

Almost surely, 2^13800020 is an apocalyptic number.

13800020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13800020 is an abundant number, since it is smaller than the sum of its proper divisors (17409844).

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

13800020 is a wasteful number, since it uses less digits than its factorization.

13800020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53099 (or 53097 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 13800020 is about 3714.8378161099. The cubic root of 13800020 is about 239.8611465328.

Adding to 13800020 its reverse (2000831), we get a palindrome (15800851).

The spelling of 13800020 in words is "thirteen million, eight hundred thousand, twenty".