20343720 has 32 divisors (see below), whose sum is σ = 61031520. Its totient is φ = 5424960.

The previous prime is 20343689. The next prime is 20343727. The reversal of 20343720 is 2734302.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20343727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84646 + ... + 84885.

It is an arithmetic number, because the mean of its divisors is an integer number (1907235).

Almost surely, 2^20343720 is an apocalyptic number.

20343720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20343720 is an abundant number, since it is smaller than the sum of its proper divisors (40687800).

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

20343720 is a wasteful number, since it uses less digits than its factorization.

20343720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169545 (or 169541 counting only the distinct ones).

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

The square root of 20343720 is about 4510.4013125220. The cubic root of 20343720 is about 272.9879370483.

The spelling of 20343720 in words is "twenty million, three hundred forty-three thousand, seven hundred twenty".