20303730 has 64 divisors (see below), whose sum is σ = 54633600. Its totient is φ = 5365440.

The previous prime is 20303719. The next prime is 20303807. The reversal of 20303730 is 3730302.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37260 + ... + 37800.

It is an arithmetic number, because the mean of its divisors is an integer number (853650).

Almost surely, 2^20303730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20303730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27316800).

20303730 is an abundant number, since it is smaller than the sum of its proper divisors (34329870).

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

20303730 is a wasteful number, since it uses less digits than its factorization.

20303730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 18.

The square root of 20303730 is about 4505.9660451450. The cubic root of 20303730 is about 272.8089473563.

The spelling of 20303730 in words is "twenty million, three hundred three thousand, seven hundred thirty".