30020520400520 has 128 divisors (see below), whose sum is σ = 72835545898080. Its totient is φ = 11070259200000.

The previous prime is 30020520400483. The next prime is 30020520400537. The reversal of 30020520400520 is 2500402502003.

It can be written as a sum of positive squares in 16 ways, for example, as 846543526084 + 29173976874436 = 920078^2 + 5401294^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1429470020 + ... + 1429491020.

Almost surely, 2^{30020520400520} is an apocalyptic number.

It is an amenable number.

30020520400520 is an abundant number, since it is smaller than the sum of its proper divisors (42815025497560).

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

30020520400520 is a wasteful number, since it uses less digits than its factorization.

30020520400520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24427 (or 24423 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

Adding to 30020520400520 its reverse (2500402502003), we get a palindrome (32520922902523).

The spelling of 30020520400520 in words is "thirty trillion, twenty billion, five hundred twenty million, four hundred thousand, five hundred twenty".