20345540520 has 32 divisors (see below), whose sum is σ = 61036621920. Its totient is φ = 5425477440.

The previous prime is 20345540513. The next prime is 20345540549. The reversal of 20345540520 is 2504554302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84772966 + ... + 84773205.

It is an arithmetic number, because the mean of its divisors is an integer number (1907394435).

Almost surely, 2^20345540520 is an apocalyptic number.

20345540520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20345540520 is an abundant number, since it is smaller than the sum of its proper divisors (40691081400).

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

20345540520 is a wasteful number, since it uses less digits than its factorization.

20345540520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169546185 (or 169546181 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The spelling of 20345540520 in words is "twenty billion, three hundred forty-five million, five hundred forty thousand, five hundred twenty".