20423004020 has 24 divisors (see below), whose sum is σ = 42972589800. Its totient is φ = 8153148032.

The previous prime is 20423003999. The next prime is 20423004023. The reversal of 20423004020 is 2040032402.

It can be written as a sum of positive squares in 4 ways, for example, as 1154232676 + 19268771344 = 33974^2 + 138812^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20423004020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423004023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 992915 + ... + 1013274.

It is an arithmetic number, because the mean of its divisors is an integer number (1790524575).

Almost surely, 2^20423004020 is an apocalyptic number.

20423004020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20423004020 is an abundant number, since it is smaller than the sum of its proper divisors (22549585780).

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

20423004020 is a wasteful number, since it uses less digits than its factorization.

20423004020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2006707 (or 2006705 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

Adding to 20423004020 its reverse (2040032402), we get a palindrome (22463036422).

The spelling of 20423004020 in words is "twenty billion, four hundred twenty-three million, four thousand, twenty".