20015534305920 has 128 divisors (see below), whose sum is σ = 63801085631040. Its totient is φ = 5337344466944.

The previous prime is 20015534305909. The next prime is 20015534305951. The reversal of 20015534305920 is 2950343551002.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×20015534305920² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97100884 + ... + 97306796.

Almost surely, 2^{20015534305920} is an apocalyptic number.

20015534305920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015534305920 is an abundant number, since it is smaller than the sum of its proper divisors (43785551325120).

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

20015534305920 is a wasteful number, since it uses less digits than its factorization.

20015534305920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256562 (or 256550 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

Adding to 20015534305920 its reverse (2950343551002), we get a palindrome (22965877856922).

The spelling of 20015534305920 in words is "twenty trillion, fifteen billion, five hundred thirty-four million, three hundred five thousand, nine hundred twenty".