13451220020 has 48 divisors (see below), whose sum is σ = 32830116480. Its totient is φ = 4533677184.

The previous prime is 13451220011. The next prime is 13451220047. The reversal of 13451220020 is 2002215431.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13451219974 and 13451220001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805979 + ... + 822498.

It is an arithmetic number, because the mean of its divisors is an integer number (683960760).

Almost surely, 2^13451220020 is an apocalyptic number.

13451220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13451220020 is an abundant number, since it is smaller than the sum of its proper divisors (19378896460).

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

13451220020 is a wasteful number, since it uses less digits than its factorization.

13451220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628552 (or 1628550 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 13451220020 its reverse (2002215431), we get a palindrome (15453435451).

The spelling of 13451220020 in words is "thirteen billion, four hundred fifty-one million, two hundred twenty thousand, twenty".