20356340 has 12 divisors (see below), whose sum is σ = 42748356. Its totient is φ = 8142528.

The previous prime is 20356337. The next prime is 20356363. The reversal of 20356340 is 4365302.

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 5779216 = 3818^2 + 2404^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508889 + ... + 508928.

It is an arithmetic number, because the mean of its divisors is an integer number (3562363).

Almost surely, 2^20356340 is an apocalyptic number.

20356340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20356340 is an abundant number, since it is smaller than the sum of its proper divisors (22392016).

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

20356340 is a wasteful number, since it uses less digits than its factorization.

20356340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017826 (or 1017824 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 20356340 is about 4511.8000842236. The cubic root of 20356340 is about 273.0443737215.

The spelling of 20356340 in words is "twenty million, three hundred fifty-six thousand, three hundred forty".