30000020 has 24 divisors (see below), whose sum is σ = 63136584. Its totient is φ = 11974016.

The previous prime is 30000001. The next prime is 30000023. The reversal of 30000020 is 2000003.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35344 + 29964676 = 188^2 + 5474^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 29999959 and 30000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9794 + ... + 12486.

It is an arithmetic number, because the mean of its divisors is an integer number (2630691).

Almost surely, 2^30000020 is an apocalyptic number.

It is an amenable number.

30000020 is an abundant number, since it is smaller than the sum of its proper divisors (33136564).

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

30000020 is a wasteful number, since it uses less digits than its factorization.

30000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259 (or 3257 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 5.

The square root of 30000020 is about 5477.2274007932. The cubic root of 30000020 is about 310.7233196450.

Adding to 30000020 its reverse (2000003), we get a palindrome (32000023).

The spelling of 30000020 in words is "thirty million, twenty", and thus it is an aban number and an uban number.