20364340 has 12 divisors (see below), whose sum is σ = 42765156. Its totient is φ = 8145728.

The previous prime is 20364329. The next prime is 20364341. The reversal of 20364340 is 4346302.

It can be written as a sum of positive squares in 2 ways, for example, as 14546596 + 5817744 = 3814^2 + 2412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20364341) 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 3 ways as a sum of consecutive naturals, for example, 509089 + ... + 509128.

It is an arithmetic number, because the mean of its divisors is an integer number (3563763).

Almost surely, 2^20364340 is an apocalyptic number.

20364340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20364340 is an abundant number, since it is smaller than the sum of its proper divisors (22400816).

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

20364340 is a wasteful number, since it uses less digits than its factorization.

20364340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018226 (or 1018224 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 20364340 is about 4512.6865612404. The cubic root of 20364340 is about 273.0801376638.

The spelling of 20364340 in words is "twenty million, three hundred sixty-four thousand, three hundred forty".