20279638 has 8 divisors (see below), whose sum is σ = 30462840. Its totient is φ = 10125360.

The previous prime is 20279599. The next prime is 20279647. The reversal of 20279638 is 83697202.

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

It is a super-2 number, since 2×20279638² = 822527434822088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20279597 and 20279606.

It is a congruent number.

It is an unprimeable number.

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, 5383 + ... + 8338.

It is an arithmetic number, because the mean of its divisors is an integer number (3807855).

Almost surely, 2^20279638 is an apocalyptic number.

20279638 is a deficient number, since it is larger than the sum of its proper divisors (10183202).

20279638 is a wasteful number, since it uses less digits than its factorization.

20279638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14462.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 20279638 is about 4503.2919070387. The cubic root of 20279638 is about 272.7010014357.

The spelling of 20279638 in words is "twenty million, two hundred seventy-nine thousand, six hundred thirty-eight".