20402211020 has 144 divisors (see below), whose sum is σ = 48334745088. Its totient is φ = 7207280640.

The previous prime is 20402211017. The next prime is 20402211043. The reversal of 20402211020 is 2011220402.

It is a junction number, because it is equal to n+sod(n) for n = 20402210986 and 20402211004.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13868885 + ... + 13870355.

It is an arithmetic number, because the mean of its divisors is an integer number (335657952).

Almost surely, 2^20402211020 is an apocalyptic number.

20402211020 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 20402211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24167372544).

20402211020 is an abundant number, since it is smaller than the sum of its proper divisors (27932534068).

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

20402211020 is a wasteful number, since it uses less digits than its factorization.

20402211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648 (or 1627 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20402211020 its reverse (2011220402), we get a palindrome (22413431422).

The spelling of 20402211020 in words is "twenty billion, four hundred two million, two hundred eleven thousand, twenty".