20469181 has 2 divisors, whose sum is σ = 20469182. Its totient is φ = 20469180.

The previous prime is 20469179. The next prime is 20469191. The reversal of 20469181 is 18196402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 443556 = 4475^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 20469181 - 2¹ = 20469179 is a prime.

It is a super-2 number, since 2×20469181² = 837974741621522, which contains 22 as substring.

Together with 20469179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20469101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10234590 + 10234591.

It is an arithmetic number, because the mean of its divisors is an integer number (10234591).

Almost surely, 2^20469181 is an apocalyptic number.

It is an amenable number.

20469181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20469181 is an equidigital number, since it uses as much as digits as its factorization.

20469181 is an evil number, because the sum of its binary digits is even.

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

The square root of 20469181 is about 4524.2878997694. The cubic root of 20469181 is about 273.5479653005.

The spelling of 20469181 in words is "twenty million, four hundred sixty-nine thousand, one hundred eighty-one".