20004370428 has 96 divisors (see below), whose sum is σ = 55754366976. Its totient is φ = 5458191552.

The previous prime is 20004370417. The next prime is 20004370447. The reversal of 20004370428 is 82407340002.

It is a junction number, because it is equal to n+sod(n) for n = 20004370395 and 20004370404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1234225 + ... + 1250327.

It is an arithmetic number, because the mean of its divisors is an integer number (580774656).

Almost surely, 2^20004370428 is an apocalyptic number.

20004370428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20004370428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27877183488).

20004370428 is an abundant number, since it is smaller than the sum of its proper divisors (35749996548).

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

20004370428 is a wasteful number, since it uses less digits than its factorization.

20004370428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16783 (or 16781 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 30.

The spelling of 20004370428 in words is "twenty billion, four million, three hundred seventy thousand, four hundred twenty-eight".