20123130420 has 72 divisors (see below), whose sum is σ = 61051806816. Its totient is φ = 5365144512.

The previous prime is 20123130407. The next prime is 20123130437. The reversal of 20123130420 is 2403132102.

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 = 20123130393 and 20123130402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1664919 + ... + 1676961.

Almost surely, 2^20123130420 is an apocalyptic number.

20123130420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20123130420 is an abundant number, since it is smaller than the sum of its proper divisors (40928676396).

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

20123130420 is a wasteful number, since it uses less digits than its factorization.

20123130420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21341 (or 21336 counting only the distinct ones).

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

Adding to 20123130420 its reverse (2403132102), we get a palindrome (22526262522).

The spelling of 20123130420 in words is "twenty billion, one hundred twenty-three million, one hundred thirty thousand, four hundred twenty".