20650560 has 168 divisors, whose sum is σ = 76443840. Its totient is φ = 4709376.

The previous prime is 20650559. The next prime is 20650571. The reversal of 20650560 is 6505602.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20650560.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46821 + ... + 47259.

Almost surely, 2^20650560 is an apocalyptic number.

20650560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20650560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38221920).

20650560 is an abundant number, since it is smaller than the sum of its proper divisors (55793280).

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

20650560 is a wasteful number, since it uses less digits than its factorization.

20650560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20650560 is about 4544.2887232217. The cubic root of 20650560 is about 274.3535670426.

The spelling of 20650560 in words is "twenty million, six hundred fifty thousand, five hundred sixty".