20011011020 has 192 divisors, whose sum is σ = 57576960000. Its totient is φ = 5757131520.

The previous prime is 20011011001. The next prime is 20011011073. The reversal of 20011011020 is 2011011002.

It is a super-2 number, since 2×20011011020² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011010989 and 20011011007.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 970781 + ... + 991179.

It is an arithmetic number, because the mean of its divisors is an integer number (299880000).

Almost surely, 2^20011011020 is an apocalyptic number.

20011011020 is a gapful number since it is divisible by the number (20) 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 20011011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28788480000).

20011011020 is an abundant number, since it is smaller than the sum of its proper divisors (37565948980).

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

20011011020 is a wasteful number, since it uses less digits than its factorization.

20011011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20453 (or 20437 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 20011011020 its reverse (2011011002), we get a palindrome (22022022022).

The spelling of 20011011020 in words is "twenty billion, eleven million, eleven thousand, twenty".