30870020 has 12 divisors (see below), whose sum is σ = 64827084. Its totient is φ = 12348000.

The previous prime is 30870013. The next prime is 30870029. The reversal of 30870020 is 2007803.

It can be written as a sum of positive squares in 2 ways, for example, as 11930116 + 18939904 = 3454^2 + 4352^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1543501 = 30870020 / (3 + 0 + 8 + 7 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 30869974 and 30870001.

It is not an unprimeable number, because it can be changed into a prime (30870029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771731 + ... + 771770.

It is an arithmetic number, because the mean of its divisors is an integer number (5402257).

Almost surely, 2^30870020 is an apocalyptic number.

It is an amenable number.

30870020 is an abundant number, since it is smaller than the sum of its proper divisors (33957064).

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

30870020 is a wasteful number, since it uses less digits than its factorization.

30870020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543510 (or 1543508 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 30870020 is about 5556.0795530662. The cubic root of 30870020 is about 313.6984000051.

Adding to 30870020 its reverse (2007803), we get a palindrome (32877823).

The spelling of 30870020 in words is "thirty million, eight hundred seventy thousand, twenty".