20694340 has 24 divisors (see below), whose sum is σ = 44519832. Its totient is φ = 8075520.

The previous prime is 20694337. The next prime is 20694343. The reversal of 20694340 is 4349602.

It is an interprime number because it is at equal distance from previous prime (20694337) and next prime (20694343).

It can be written as a sum of positive squares in 4 ways, for example, as 695556 + 19998784 = 834^2 + 4472^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20694299 and 20694308.

It is not an unprimeable number, because it can be changed into a prime (20694343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11799 + ... + 13438.

It is an arithmetic number, because the mean of its divisors is an integer number (1854993).

Almost surely, 2^20694340 is an apocalyptic number.

20694340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20694340 is an abundant number, since it is smaller than the sum of its proper divisors (23825492).

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

20694340 is a wasteful number, since it uses less digits than its factorization.

20694340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25287 (or 25285 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20694340 is about 4549.1032083258. The cubic root of 20694340 is about 274.5473103128.

The spelling of 20694340 in words is "twenty million, six hundred ninety-four thousand, three hundred forty".