202123123020 has 288 divisors, whose sum is σ = 766967160960. Its totient is φ = 41946439680.

The previous prime is 202123123009. The next prime is 202123123051. The reversal of 202123123020 is 20321321202.

202123123020 is a `hidden beast` number, since 202 + 1 + 231 + 230 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 202123122984 and 202123123002.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 898036 + ... + 1100324.

It is an arithmetic number, because the mean of its divisors is an integer number (2663080420).

Almost surely, 2^202123123020 is an apocalyptic number.

202123123020 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 202123123020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383483580480).

202123123020 is an abundant number, since it is smaller than the sum of its proper divisors (564844037940).

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

202123123020 is a wasteful number, since it uses less digits than its factorization.

202123123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202385 (or 202380 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 202123123020 its reverse (20321321202), we get a palindrome (222444444222).

The spelling of 202123123020 in words is "two hundred two billion, one hundred twenty-three million, one hundred twenty-three thousand, twenty".