20123430136 has 32 divisors (see below), whose sum is σ = 39863016000. Its totient is φ = 9508057216.

The previous prime is 20123430127. The next prime is 20123430139. The reversal of 20123430136 is 63103432102.

It is a self number, because there is not a number n which added to its sum of digits gives 20123430136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123430139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911851 + ... + 933658.

It is an arithmetic number, because the mean of its divisors is an integer number (1245719250).

Almost surely, 2^20123430136 is an apocalyptic number.

It is an amenable number.

20123430136 is a deficient number, since it is larger than the sum of its proper divisors (19739585864).

20123430136 is a wasteful number, since it uses less digits than its factorization.

20123430136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845591 (or 1845587 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20123430136 its reverse (63103432102), we get a palindrome (83226862238).

The spelling of 20123430136 in words is "twenty billion, one hundred twenty-three million, four hundred thirty thousand, one hundred thirty-six".