20705340 has 24 divisors (see below), whose sum is σ = 57975120. Its totient is φ = 5521408.

The previous prime is 20705323. The next prime is 20705357. The reversal of 20705340 is 4350702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20705323) and next prime (20705357).

It is a super-2 number, since 2×20705340² = 857422209031200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172485 + ... + 172604.

It is an arithmetic number, because the mean of its divisors is an integer number (2415630).

Almost surely, 2^20705340 is an apocalyptic number.

20705340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20705340 is an abundant number, since it is smaller than the sum of its proper divisors (37269780).

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

20705340 is a wasteful number, since it uses less digits than its factorization.

20705340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345101 (or 345099 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20705340 is about 4550.3120772097. The cubic root of 20705340 is about 274.5959465659.

The spelling of 20705340 in words is "twenty million, seven hundred five thousand, three hundred forty".