20645016 has 32 divisors (see below), whose sum is σ = 58986240. Its totient is φ = 5898528.

The previous prime is 20644997. The next prime is 20645033. The reversal of 20645016 is 61054602.

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

It is a congruent number.

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, 61276 + ... + 61611.

It is an arithmetic number, because the mean of its divisors is an integer number (1843320).

Almost surely, 2^20645016 is an apocalyptic number.

It is an amenable number.

20645016 is an abundant number, since it is smaller than the sum of its proper divisors (38341224).

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

20645016 is a wasteful number, since it uses less digits than its factorization.

20645016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122903 (or 122899 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20645016 is about 4543.6786858228. The cubic root of 20645016 is about 274.3290131917.

Adding to 20645016 its reverse (61054602), we get a palindrome (81699618).

The spelling of 20645016 in words is "twenty million, six hundred forty-five thousand, sixteen".