20861416 has 8 divisors (see below), whose sum is σ = 39115170. Its totient is φ = 10430704.

The previous prime is 20861413. The next prime is 20861417. The reversal of 20861416 is 61416802.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 122500 = 4554^2 + 350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20861413) 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 as a sum of consecutive naturals, namely, 1303831 + ... + 1303846.

Almost surely, 2^20861416 is an apocalyptic number.

It is an amenable number.

20861416 is a deficient number, since it is larger than the sum of its proper divisors (18253754).

20861416 is a wasteful number, since it uses less digits than its factorization.

20861416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2607683 (or 2607679 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20861416 is about 4567.4299118870. The cubic root of 20861416 is about 275.2841844601.

The spelling of 20861416 in words is "twenty million, eight hundred sixty-one thousand, four hundred sixteen".