20279616 has 112 divisors (see below), whose sum is σ = 62423040. Its totient is φ = 5690880.

The previous prime is 20279599. The next prime is 20279647. The reversal of 20279616 is 61697202.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×20279616² = 822525650214912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106081 + ... + 106271.

Almost surely, 2^20279616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20279616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31211520).

20279616 is an abundant number, since it is smaller than the sum of its proper divisors (42143424).

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

20279616 is a wasteful number, since it uses less digits than its factorization.

20279616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20279616 is about 4503.2894643805. The cubic root of 20279616 is about 272.7009028241.

The spelling of 20279616 in words is "twenty million, two hundred seventy-nine thousand, six hundred sixteen".