20123430420402 has 48 divisors (see below), whose sum is σ = 43680462265440. Its totient is φ = 6695550964800.

The previous prime is 20123430420377. The next prime is 20123430420439. The reversal of 20123430420402 is 20402403432102.

20123430420402 is a `hidden beast` number, since 2 + 0 + 1 + 23 + 430 + 4 + 204 + 0 + 2 = 666.

It is a super-2 number, since 2×20123430420402² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148850377 + ... + 148985507.

It is an arithmetic number, because the mean of its divisors is an integer number (910009630530).

Almost surely, 2^{20123430420402} is an apocalyptic number.

20123430420402 is an abundant number, since it is smaller than the sum of its proper divisors (23557031845038).

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

20123430420402 is a wasteful number, since it uses less digits than its factorization.

20123430420402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150199 (or 150196 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20123430420402 its reverse (20402403432102), we get a palindrome (40525833852504).

The spelling of 20123430420402 in words is "twenty trillion, one hundred twenty-three billion, four hundred thirty million, four hundred twenty thousand, four hundred two".