20279172 has 12 divisors (see below), whose sum is σ = 47318096. Its totient is φ = 6759720.

The previous prime is 20279159. The next prime is 20279179. The reversal of 20279172 is 27197202.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20279172² = 822489634011168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20279179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844954 + ... + 844977.

Almost surely, 2^20279172 is an apocalyptic number.

It is an amenable number.

20279172 is an abundant number, since it is smaller than the sum of its proper divisors (27038924).

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

20279172 is a wasteful number, since it uses less digits than its factorization.

20279172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689938 (or 1689936 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20279172 is about 4503.2401668132. The cubic root of 20279172 is about 272.6989126470.

The spelling of 20279172 in words is "twenty million, two hundred seventy-nine thousand, one hundred seventy-two".