20104123402 has 16 divisors (see below), whose sum is σ = 34629112800. Its totient is φ = 8657277840.

The previous prime is 20104123387. The next prime is 20104123409. The reversal of 20104123402 is 20432140102.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 20104123402.

It is not an unprimeable number, because it can be changed into a prime (20104123409) 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, 24047577 + ... + 24048412.

It is an arithmetic number, because the mean of its divisors is an integer number (2164319550).

Almost surely, 2^20104123402 is an apocalyptic number.

20104123402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20104123402 is a deficient number, since it is larger than the sum of its proper divisors (14524989398).

20104123402 is a wasteful number, since it uses less digits than its factorization.

20104123402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48096021.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20104123402 its reverse (20432140102), we get a palindrome (40536263504).

The spelling of 20104123402 in words is "twenty billion, one hundred four million, one hundred twenty-three thousand, four hundred two".