20706361 has 4 divisors (see below), whose sum is σ = 22299172. Its totient is φ = 19113552.

The previous prime is 20706359. The next prime is 20706373. The reversal of 20706361 is 16360702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16360702 = 2 ⋅8180351.

It can be written as a sum of positive squares in 2 ways, for example, as 1836025 + 18870336 = 1355^2 + 4344^2 .

It is a cyclic number.

It is not a de Polignac number, because 20706361 - 2¹ = 20706359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20706311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796386 + ... + 796411.

It is an arithmetic number, because the mean of its divisors is an integer number (5574793).

Almost surely, 2^20706361 is an apocalyptic number.

It is an amenable number.

20706361 is a deficient number, since it is larger than the sum of its proper divisors (1592811).

20706361 is a wasteful number, since it uses less digits than its factorization.

20706361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592810.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 20706361 is about 4550.4242659339. The cubic root of 20706361 is about 274.6004600208.

The spelling of 20706361 in words is "twenty million, seven hundred six thousand, three hundred sixty-one".