20469138 has 8 divisors (see below), whose sum is σ = 40938288. Its totient is φ = 6823044.

The previous prime is 20469133. The next prime is 20469151. The reversal of 20469138 is 83196402.

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

20469138 is an admirable number.

It is a super-2 number, since 2×20469138² = 837971220926088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20469099 and 20469108.

It is not an unprimeable number, because it can be changed into a prime (20469131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1705756 + ... + 1705767.

It is an arithmetic number, because the mean of its divisors is an integer number (5117286).

Almost surely, 2^20469138 is an apocalyptic number.

20469138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20469138 is a wasteful number, since it uses less digits than its factorization.

20469138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411528.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20469138 is about 4524.2831476379. The cubic root of 20469138 is about 273.5477737512.

The spelling of 20469138 in words is "twenty million, four hundred sixty-nine thousand, one hundred thirty-eight".