20430040511500 has 48 divisors (see below), whose sum is σ = 44665161349536. Its totient is φ = 8163599928000.

The previous prime is 20430040511477. The next prime is 20430040511509. The reversal of 20430040511500 is 511504003402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20430040511509) 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, 20554707 + ... + 21525706.

It is an arithmetic number, because the mean of its divisors is an integer number (930524194782).

Almost surely, 2^{20430040511500} is an apocalyptic number.

20430040511500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20430040511500 is an abundant number, since it is smaller than the sum of its proper divisors (24235120838036).

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

20430040511500 is a wasteful number, since it uses less digits than its factorization.

20430040511500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42081403 (or 42081391 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 20430040511500 its reverse (511504003402), we get a palindrome (20941544514902).

The spelling of 20430040511500 in words is "twenty trillion, four hundred thirty billion, forty million, five hundred eleven thousand, five hundred".