20717000 has 32 divisors (see below), whose sum is σ = 48480120. Its totient is φ = 8286400.

The previous prime is 20716987. The next prime is 20717023. The reversal of 20717000 is 71702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1304164 + 19412836 = 1142^2 + 4406^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20717000.

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, 9359 + ... + 11358.

Almost surely, 2^20717000 is an apocalyptic number.

20717000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20717000 is an abundant number, since it is smaller than the sum of its proper divisors (27763120).

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

20717000 is a wasteful number, since it uses less digits than its factorization.

20717000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20738 (or 20724 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 20717000 is about 4551.5931276862. The cubic root of 20717000 is about 274.6474821908.

Adding to 20717000 its reverse (71702), we get a palindrome (20788702).

The spelling of 20717000 in words is "twenty million, seven hundred seventeen thousand".