20122830 has 216 divisors, whose sum is σ = 68343912. Its totient is φ = 4245696.

The previous prime is 20122829. The next prime is 20122831. The reversal of 20122830 is 3822102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20122829) and next prime (20122831).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122831) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1547904 + ... + 1547916.

It is an arithmetic number, because the mean of its divisors is an integer number (316407).

Almost surely, 2^20122830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20122830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34171956).

20122830 is an abundant number, since it is smaller than the sum of its proper divisors (48221082).

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

20122830 is a wasteful number, since it uses less digits than its factorization.

20122830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20122830 is about 4485.8477459673. The cubic root of 20122830 is about 271.9963144685.

Adding to 20122830 its reverse (3822102), we get a palindrome (23944932).

The spelling of 20122830 in words is "twenty million, one hundred twenty-two thousand, eight hundred thirty".