20013560 has 48 divisors (see below), whose sum is σ = 52387560. Its totient is φ = 6861120.

The previous prime is 20013557. The next prime is 20013563. The reversal of 20013560 is 6531002.

It is an interprime number because it is at equal distance from previous prime (20013557) and next prime (20013563).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3146 + ... + 7065.

Almost surely, 2^20013560 is an apocalyptic number.

20013560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013560 is an abundant number, since it is smaller than the sum of its proper divisors (32374000).

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

20013560 is a wasteful number, since it uses less digits than its factorization.

20013560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236 (or 10225 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 20013560 is about 4473.6517522042. The cubic root of 20013560 is about 271.5030936387.

Adding to 20013560 its reverse (6531002), we get a palindrome (26544562).

The spelling of 20013560 in words is "twenty million, thirteen thousand, five hundred sixty".