20347740 has 144 divisors (see below), whose sum is σ = 73735200. Its totient is φ = 4644864.

The previous prime is 20347739. The next prime is 20347771. The reversal of 20347740 is 4774302.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 26076 + ... + 26844.

It is an arithmetic number, because the mean of its divisors is an integer number (512050).

Almost surely, 2^20347740 is an apocalyptic number.

20347740 is a gapful number since it is divisible by the number (20) 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 20347740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36867600).

20347740 is an abundant number, since it is smaller than the sum of its proper divisors (53387460).

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

20347740 is a wasteful number, since it uses less digits than its factorization.

20347740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 20347740 is about 4510.8469271302. The cubic root of 20347740 is about 273.0059170315.

The spelling of 20347740 in words is "twenty million, three hundred forty-seven thousand, seven hundred forty".