20265616 has 30 divisors (see below), whose sum is σ = 45676950. Its totient is φ = 8684928.

The previous prime is 20265613. The next prime is 20265629. The reversal of 20265616 is 61656202.

It can be written as a sum of positive squares in only one way, i.e., 11289600 + 8976016 = 3360^2 + 2996^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20265611) 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 5 ways as a sum of consecutive naturals, for example, 12141 + ... + 13708.

It is an arithmetic number, because the mean of its divisors is an integer number (1522565).

Almost surely, 2^20265616 is an apocalyptic number.

It is an amenable number.

20265616 is an abundant number, since it is smaller than the sum of its proper divisors (25411334).

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

20265616 is a wasteful number, since it uses less digits than its factorization.

20265616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25871 (or 25858 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20265616 is about 4501.7347767277. The cubic root of 20265616 is about 272.6381355029.

The spelling of 20265616 in words is "twenty million, two hundred sixty-five thousand, six hundred sixteen".