20660416 has 56 divisors (see below), whose sum is σ = 47402496. Its totient is φ = 8751360.

The previous prime is 20660399. The next prime is 20660473. The reversal of 20660416 is 61406602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47721 + ... + 48151.

Almost surely, 2^20660416 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 20660416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23701248).

20660416 is an abundant number, since it is smaller than the sum of its proper divisors (26742080).

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

20660416 is a wasteful number, since it uses less digits than its factorization.

20660416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20660416 is about 4545.3730319964. The cubic root of 20660416 is about 274.3972074843.

The spelling of 20660416 in words is "twenty million, six hundred sixty thousand, four hundred sixteen".