20123151530 has 32 divisors (see below), whose sum is σ = 37319874768. Its totient is φ = 7808832000.

The previous prime is 20123151527. The next prime is 20123151553. The reversal of 20123151530 is 3515132102.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4062405169 + 16060746361 = 63737^2 + 126731^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20123151496 and 20123151505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181421 + ... + 270480.

Almost surely, 2^20123151530 is an apocalyptic number.

20123151530 is a deficient number, since it is larger than the sum of its proper divisors (17196723238).

20123151530 is a wasteful number, since it uses less digits than its factorization.

20123151530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452042.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 20123151530 its reverse (3515132102), we get a palindrome (23638283632).

The spelling of 20123151530 in words is "twenty billion, one hundred twenty-three million, one hundred fifty-one thousand, five hundred thirty".