20172310420 has 24 divisors (see below), whose sum is σ = 42994121184. Its totient is φ = 7948491936.

The previous prime is 20172310363. The next prime is 20172310427. The reversal of 20172310420 is 2401327102.

It is a junction number, because it is equal to n+sod(n) for n = 20172310391 and 20172310400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20172310427) 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, 7525642 + ... + 7528321.

It is an arithmetic number, because the mean of its divisors is an integer number (1791421716).

Almost surely, 2^20172310420 is an apocalyptic number.

20172310420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20172310420 is an abundant number, since it is smaller than the sum of its proper divisors (22821810764).

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

20172310420 is a wasteful number, since it uses less digits than its factorization.

20172310420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15054039 (or 15054037 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 20172310420 its reverse (2401327102), we get a palindrome (22573637522).

The spelling of 20172310420 in words is "twenty billion, one hundred seventy-two million, three hundred ten thousand, four hundred twenty".