20291136 has 28 divisors (see below), whose sum is σ = 53687472. Its totient is φ = 6763648.

The previous prime is 20291123. The next prime is 20291137. The reversal of 20291136 is 63119202.

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

It is not an unprimeable number, because it can be changed into a prime (20291137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52650 + ... + 53033.

Almost surely, 2^20291136 is an apocalyptic number.

It is an amenable number.

20291136 is an abundant number, since it is smaller than the sum of its proper divisors (33396336).

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

20291136 is a wasteful number, since it uses less digits than its factorization.

20291136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105698 (or 105688 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 20291136 is about 4504.5683477998. The cubic root of 20291136 is about 272.7525297013.

The spelling of 20291136 in words is "twenty million, two hundred ninety-one thousand, one hundred thirty-six".