30740220 has 144 divisors (see below), whose sum is σ = 110143488. Its totient is φ = 6791040.

The previous prime is 30740219. The next prime is 30740257. The reversal of 30740220 is 2204703.

It is a happy number.

It is a super-2 number, since 2×30740220² = 1889922251296800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30740193 and 30740202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38667 + ... + 39453.

Almost surely, 2^30740220 is an apocalyptic number.

30740220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30740220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55071744).

30740220 is an abundant number, since it is smaller than the sum of its proper divisors (79403268).

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

30740220 is a wasteful number, since it uses less digits than its factorization.

30740220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 835 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 30740220 is about 5544.3863501744. The cubic root of 30740220 is about 313.2581103062.

Adding to 30740220 its reverse (2204703), we get a palindrome (32944923).

The spelling of 30740220 in words is "thirty million, seven hundred forty thousand, two hundred twenty".