20123215630 has 24 divisors (see below), whose sum is σ = 42135550488. Its totient is φ = 6899388048.

The previous prime is 20123215603. The next prime is 20123215631. The reversal of 20123215630 is 3651232102.

It is a junction number, because it is equal to n+sod(n) for n = 20123215595 and 20123215604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123215631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20533404 + ... + 20534383.

It is an arithmetic number, because the mean of its divisors is an integer number (1755647937).

Almost surely, 2^20123215630 is an apocalyptic number.

20123215630 is an abundant number, since it is smaller than the sum of its proper divisors (22012334858).

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

20123215630 is a wasteful number, since it uses less digits than its factorization.

20123215630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41067808 (or 41067801 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 20123215630 its reverse (3651232102), we get a palindrome (23774447732).

The spelling of 20123215630 in words is "twenty billion, one hundred twenty-three million, two hundred fifteen thousand, six hundred thirty".