20145515500 has 96 divisors (see below), whose sum is σ = 48243843648. Its totient is φ = 7288064000.

The previous prime is 20145515479. The next prime is 20145515501. The reversal of 20145515500 is 551554102.

It is not an unprimeable number, because it can be changed into a prime (20145515501) 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, 1074204 + ... + 1092796.

It is an arithmetic number, because the mean of its divisors is an integer number (502540038).

Almost surely, 2^20145515500 is an apocalyptic number.

20145515500 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 20145515500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24121921824).

20145515500 is an abundant number, since it is smaller than the sum of its proper divisors (28098328148).

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

20145515500 is a wasteful number, since it uses less digits than its factorization.

20145515500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18820 (or 18808 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 20145515500 in words is "twenty billion, one hundred forty-five million, five hundred fifteen thousand, five hundred".