20120021020 has 96 divisors (see below), whose sum is σ = 47397353472. Its totient is φ = 7110720000.

The previous prime is 20120020993. The next prime is 20120021023. The reversal of 20120021020 is 2012002102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20120020988 and 20120021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120021023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2440305 + ... + 2448535.

It is an arithmetic number, because the mean of its divisors is an integer number (493722432).

Almost surely, 2^20120021020 is an apocalyptic number.

20120021020 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 20120021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23698676736).

20120021020 is an abundant number, since it is smaller than the sum of its proper divisors (27277332452).

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

20120021020 is a wasteful number, since it uses less digits than its factorization.

20120021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563 (or 8561 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

20120021020 divided by its sum of digits (10) gives a palindrome (2012002102).

Adding to 20120021020 its reverse (2012002102), we get a palindrome (22132023122).

The spelling of 20120021020 in words is "twenty billion, one hundred twenty million, twenty-one thousand, twenty".