20001560 has 32 divisors (see below), whose sum is σ = 45131040. Its totient is φ = 7977984.

The previous prime is 20001557. The next prime is 20001613. The reversal of 20001560 is 6510002.

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, 26549 + ... + 27291.

It is an arithmetic number, because the mean of its divisors is an integer number (1410345).

Almost surely, 2^20001560 is an apocalyptic number.

20001560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001560 is an abundant number, since it is smaller than the sum of its proper divisors (25129480).

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

20001560 is a wasteful number, since it uses less digits than its factorization.

20001560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 20001560 is about 4472.3103649009. The cubic root of 20001560 is about 271.4488189618.

Adding to 20001560 its reverse (6510002), we get a palindrome (26511562).

The spelling of 20001560 in words is "twenty million, one thousand, five hundred sixty".