20351136 has 96 divisors (see below), whose sum is σ = 60117120. Its totient is φ = 5981184.

The previous prime is 20351131. The next prime is 20351143. The reversal of 20351136 is 63115302.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (20351131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28350 + ... + 29058.

It is an arithmetic number, because the mean of its divisors is an integer number (626220).

Almost surely, 2^20351136 is an apocalyptic number.

20351136 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 20351136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30058560).

20351136 is an abundant number, since it is smaller than the sum of its proper divisors (39765984).

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

20351136 is a wasteful number, since it uses less digits than its factorization.

20351136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20351136 is about 4511.2233374108. The cubic root of 20351136 is about 273.0211042467.

Adding to 20351136 its reverse (63115302), we get a palindrome (83466438).

The spelling of 20351136 in words is "twenty million, three hundred fifty-one thousand, one hundred thirty-six".