1101220020 has 72 divisors (see below), whose sum is σ = 3343441920. Its totient is φ = 293388480.

The previous prime is 1101220019. The next prime is 1101220027. The reversal of 1101220020 is 200221011.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1101219984 and 1101220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101220027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262701 + ... + 266859.

Almost surely, 2^1101220020 is an apocalyptic number.

1101220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101220020 is an abundant number, since it is smaller than the sum of its proper divisors (2242221900).

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

1101220020 is a wasteful number, since it uses less digits than its factorization.

1101220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5645 (or 5640 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1101220020 is about 33184.6353000903. The cubic root of 1101220020 is about 1032.6616115377.

Adding to 1101220020 its reverse (200221011), we get a palindrome (1301441031).

Subtracting from 1101220020 its reverse (200221011), we obtain a palindrome (900999009).

The spelling of 1101220020 in words is "one billion, one hundred one million, two hundred twenty thousand, twenty".