20169881 has 8 divisors (see below), whose sum is σ = 20949984. Its totient is φ = 19404000.

The previous prime is 20169859. The next prime is 20169883. The reversal of 20169881 is 18896102.

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 20169881 - 2⁶ = 20169817 is a prime.

It is a super-2 number, since 2×20169881² = 813648199108322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20169883) 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, 620 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (2618748).

Almost surely, 2^20169881 is an apocalyptic number.

It is an amenable number.

20169881 is a deficient number, since it is larger than the sum of its proper divisors (780103).

20169881 is an equidigital number, since it uses as much as digits as its factorization.

20169881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 20169881 is about 4491.0890661397. The cubic root of 20169881 is about 272.2081424775.

The spelling of 20169881 in words is "twenty million, one hundred sixty-nine thousand, eight hundred eighty-one".