20517080 has 16 divisors (see below), whose sum is σ = 46163520. Its totient is φ = 8206816.

The previous prime is 20517067. The next prime is 20517109. The reversal of 20517080 is 8071502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256424 + ... + 256503.

It is an arithmetic number, because the mean of its divisors is an integer number (2885220).

Almost surely, 2^20517080 is an apocalyptic number.

20517080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20517080 is an abundant number, since it is smaller than the sum of its proper divisors (25646440).

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

20517080 is a wasteful number, since it uses less digits than its factorization.

20517080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512938 (or 512934 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 20517080 is about 4529.5783468221. The cubic root of 20517080 is about 273.7611714685.

Adding to 20517080 its reverse (8071502), we get a palindrome (28588582).

The spelling of 20517080 in words is "twenty million, five hundred seventeen thousand, eighty".