20123020 has 12 divisors (see below), whose sum is σ = 42258384. Its totient is φ = 8049200.

The previous prime is 20123017. The next prime is 20123021. The reversal of 20123020 is 2032102.

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 = 20122988 and 20123006.

It is not an unprimeable number, because it can be changed into a prime (20123021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503056 + ... + 503095.

It is an arithmetic number, because the mean of its divisors is an integer number (3521532).

Almost surely, 2^20123020 is an apocalyptic number.

20123020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123020 is an abundant number, since it is smaller than the sum of its proper divisors (22135364).

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

20123020 is a wasteful number, since it uses less digits than its factorization.

20123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006160 (or 1006158 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20123020 is about 4485.8689236312. The cubic root of 20123020 is about 271.9971705300.

Adding to 20123020 its reverse (2032102), we get a palindrome (22155122).

The spelling of 20123020 in words is "twenty million, one hundred twenty-three thousand, twenty".