30669820 has 24 divisors (see below), whose sum is σ = 66628800. Its totient is φ = 11844672.

The previous prime is 30669811. The next prime is 30669827. The reversal of 30669820 is 2896603.

30669820 = 386² + 387² + ... + 530².

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30669827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25860 + ... + 27019.

It is an arithmetic number, because the mean of its divisors is an integer number (2776200).

Almost surely, 2^30669820 is an apocalyptic number.

It is an amenable number.

30669820 is an abundant number, since it is smaller than the sum of its proper divisors (35958980).

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

30669820 is a wasteful number, since it uses less digits than its factorization.

30669820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52917 (or 52915 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 30669820 is about 5538.0339471693. The cubic root of 30669820 is about 313.0187905305.

The spelling of 30669820 in words is "thirty million, six hundred sixty-nine thousand, eight hundred twenty".