20421004000 has 96 divisors (see below), whose sum is σ = 50312598336. Its totient is φ = 8145907200.

The previous prime is 20421003931. The next prime is 20421004001. The reversal of 20421004000 is 40012402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421004001) 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, 1485157 + ... + 1498843.

It is an arithmetic number, because the mean of its divisors is an integer number (524089566).

Almost surely, 2^20421004000 is an apocalyptic number.

20421004000 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 20421004000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25156299168).

20421004000 is an abundant number, since it is smaller than the sum of its proper divisors (29891594336).

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

20421004000 is a wasteful number, since it uses less digits than its factorization.

20421004000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14085 (or 14067 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20421004000 its reverse (40012402), we get a palindrome (20461016402).

The spelling of 20421004000 in words is "twenty billion, four hundred twenty-one million, four thousand".