12122020 has 48 divisors (see below), whose sum is σ = 27297648. Its totient is φ = 4505600.

The previous prime is 12122009. The next prime is 12122021. The reversal of 12122020 is 2022121.

12122020 = T₄₉₁ + T₄₉₂ + ... + T₅₇₅.

It can be written as a sum of positive squares in 8 ways, for example, as 1218816 + 10903204 = 1104^2 + 3302^2 .

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 = 12121988 and 12122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122021) 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, 34164 + ... + 34516.

It is an arithmetic number, because the mean of its divisors is an integer number (568701).

Almost surely, 2^12122020 is an apocalyptic number.

12122020 is a gapful number since it is divisible by the number (10) 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 12122020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13648824).

12122020 is an abundant number, since it is smaller than the sum of its proper divisors (15175628).

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

12122020 is a wasteful number, since it uses less digits than its factorization.

12122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 478 counting only the distinct ones).

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

The square root of 12122020 is about 3481.6691399385. The cubic root of 12122020 is about 229.7162221629.

Adding to 12122020 its reverse (2022121), we get a palindrome (14144141).

The spelling of 12122020 in words is "twelve million, one hundred twenty-two thousand, twenty".