20154500000 has 168 divisors, whose sum is σ = 50099124348. Its totient is φ = 7980800000.

The previous prime is 20154499951. The next prime is 20154500027. The reversal of 20154500000 is 545102.

It can be written as a sum of positive squares in 14 ways, for example, as 16485532816 + 3668967184 = 128396^2 + 60572^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 86499884 + ... + 86500116.

Almost surely, 2^20154500000 is an apocalyptic number.

20154500000 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 20154500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25049562174).

20154500000 is an abundant number, since it is smaller than the sum of its proper divisors (29944624348).

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

20154500000 is an frugal number, since it uses more digits than its factorization.

20154500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The spelling of 20154500000 in words is "twenty billion, one hundred fifty-four million, five hundred thousand".