20507136 has 120 divisors (see below), whose sum is σ = 59906880. Its totient is φ = 6230016.

The previous prime is 20507111. The next prime is 20507171. The reversal of 20507136 is 63170502.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259545 + ... + 259623.

It is an arithmetic number, because the mean of its divisors is an integer number (499224).

Almost surely, 2^20507136 is an apocalyptic number.

20507136 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20507136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29953440).

20507136 is an abundant number, since it is smaller than the sum of its proper divisors (39399744).

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

20507136 is an equidigital number, since it uses as much as digits as its factorization.

20507136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20507136 is about 4528.4805398721. The cubic root of 20507136 is about 273.7169364375.

Adding to 20507136 its reverse (63170502), we get a palindrome (83677638).

The spelling of 20507136 in words is "twenty million, five hundred seven thousand, one hundred thirty-six".