20013121020 has 48 divisors (see below), whose sum is σ = 56711894400. Its totient is φ = 5272531776.

The previous prime is 20013121003. The next prime is 20013121027. The reversal of 20013121020 is 2012131002.

It is a super-2 number, since 2×20013121020² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20013120987 and 20013121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013121027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2004370 + ... + 2014329.

It is an arithmetic number, because the mean of its divisors is an integer number (1181497800).

Almost surely, 2^20013121020 is an apocalyptic number.

20013121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013121020 is an abundant number, since it is smaller than the sum of its proper divisors (36698773380).

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

20013121020 is a wasteful number, since it uses less digits than its factorization.

20013121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4018794 (or 4018792 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20013121020 its reverse (2012131002), we get a palindrome (22025252022).

The spelling of 20013121020 in words is "twenty billion, thirteen million, one hundred twenty-one thousand, twenty".