20551016 has 32 divisors (see below), whose sum is σ = 40089600. Its totient is φ = 9865920.

The previous prime is 20551007. The next prime is 20551019. The reversal of 20551016 is 61015502.

It is not an unprimeable number, because it can be changed into a prime (20551019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42665 + ... + 43143.

It is an arithmetic number, because the mean of its divisors is an integer number (1252800).

Almost surely, 2^20551016 is an apocalyptic number.

It is an amenable number.

20551016 is a deficient number, since it is larger than the sum of its proper divisors (19538584).

20551016 is a wasteful number, since it uses less digits than its factorization.

20551016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20551016 is about 4533.3228431251. The cubic root of 20551016 is about 273.9120253200.

Adding to 20551016 its reverse (61015502), we get a palindrome (81566518).

The spelling of 20551016 in words is "twenty million, five hundred fifty-one thousand, sixteen".