20100434420 has 48 divisors (see below), whose sum is σ = 46091179008. Its totient is φ = 7302437760.

The previous prime is 20100434407. The next prime is 20100434429. The reversal of 20100434420 is 2443400102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20100434392 and 20100434401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100434429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197114 + ... + 281166.

It is an arithmetic number, because the mean of its divisors is an integer number (960232896).

Almost surely, 2^20100434420 is an apocalyptic number.

20100434420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100434420 is an abundant number, since it is smaller than the sum of its proper divisors (25990744588).

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

20100434420 is a wasteful number, since it uses less digits than its factorization.

20100434420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85160 (or 85158 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20100434420 its reverse (2443400102), we get a palindrome (22543834522).

The spelling of 20100434420 in words is "twenty billion, one hundred million, four hundred thirty-four thousand, four hundred twenty".