20742330 has 32 divisors (see below), whose sum is σ = 56893824. Its totient is φ = 4741056.

The previous prime is 20742307. The next prime is 20742353. The reversal of 20742330 is 3324702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20742307) and next prime (20742353).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20742297 and 20742306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49177 + ... + 49596.

It is an arithmetic number, because the mean of its divisors is an integer number (1777932).

Almost surely, 2^20742330 is an apocalyptic number.

20742330 is an abundant number, since it is smaller than the sum of its proper divisors (36151494).

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

20742330 is a wasteful number, since it uses less digits than its factorization.

20742330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98790.

The product of its (nonzero) digits is 1008, while the sum is 21.

The square root of 20742330 is about 4554.3748198847. The cubic root of 20742330 is about 274.7593707744.

The spelling of 20742330 in words is "twenty million, seven hundred forty-two thousand, three hundred thirty".