30511204220 has 24 divisors (see below), whose sum is σ = 73226890464. Its totient is φ = 10460984256.

The previous prime is 30511204159. The next prime is 30511204237. The reversal of 30511204220 is 2240211503.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 30511204192 and 30511204201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108968447 + ... + 108968726.

It is an arithmetic number, because the mean of its divisors is an integer number (3051120436).

Almost surely, 2^30511204220 is an apocalyptic number.

It is an amenable number.

30511204220 is an abundant number, since it is smaller than the sum of its proper divisors (42715686244).

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

30511204220 is a wasteful number, since it uses less digits than its factorization.

30511204220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217937189 (or 217937187 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 30511204220 its reverse (2240211503), we get a palindrome (32751415723).

The spelling of 30511204220 in words is "thirty billion, five hundred eleven million, two hundred four thousand, two hundred twenty".