20012550420 has 96 divisors (see below), whose sum is σ = 56837088000. Its totient is φ = 5260806144.

The previous prime is 20012550391. The next prime is 20012550421. The reversal of 20012550420 is 2405521002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012550421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1293772 + ... + 1309148.

It is an arithmetic number, because the mean of its divisors is an integer number (592053000).

Almost surely, 2^20012550420 is an apocalyptic number.

20012550420 is a gapful number since it is divisible by the number (20) 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 20012550420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28418544000).

20012550420 is an abundant number, since it is smaller than the sum of its proper divisors (36824537580).

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

20012550420 is a wasteful number, since it uses less digits than its factorization.

20012550420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15697 (or 15695 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The spelling of 20012550420 in words is "twenty billion, twelve million, five hundred fifty thousand, four hundred twenty".