20154421500 has 192 divisors, whose sum is σ = 59439744000. Its totient is φ = 5306400000.

The previous prime is 20154421457. The next prime is 20154421501. The reversal of 20154421500 is 512445102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154421501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74923366 + ... + 74923634.

It is an arithmetic number, because the mean of its divisors is an integer number (309582000).

Almost surely, 2^20154421500 is an apocalyptic number.

20154421500 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 20154421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29719872000).

20154421500 is an abundant number, since it is smaller than the sum of its proper divisors (39285322500).

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

20154421500 is a wasteful number, since it uses less digits than its factorization.

20154421500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 20154421500 its reverse (512445102), we get a palindrome (20666866602).

The spelling of 20154421500 in words is "twenty billion, one hundred fifty-four million, four hundred twenty-one thousand, five hundred".