20946181 has 8 divisors (see below), whose sum is σ = 21622304. Its totient is φ = 20275920.

The previous prime is 20946179. The next prime is 20946197. The reversal of 20946181 is 18164902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20946181 - 2¹ = 20946179 is a prime.

It is a super-2 number, since 2×20946181² = 877484996969522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20946131) 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, 6466 + ... + 9148.

It is an arithmetic number, because the mean of its divisors is an integer number (2702788).

Almost surely, 2^20946181 is an apocalyptic number.

It is an amenable number.

20946181 is a deficient number, since it is larger than the sum of its proper divisors (676123).

20946181 is a wasteful number, since it uses less digits than its factorization.

20946181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20946181 is about 4576.6997935193. The cubic root of 20946181 is about 275.6565294392.

The spelling of 20946181 in words is "twenty million, nine hundred forty-six thousand, one hundred eighty-one".