20091455 has 12 divisors (see below), whose sum is σ = 25447752. Its totient is φ = 15225840.

The previous prime is 20091451. The next prime is 20091457. The reversal of 20091455 is 55419002.

It is not a de Polignac number, because 20091455 - 2² = 20091451 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3761 + ... + 7370.

It is an arithmetic number, because the mean of its divisors is an integer number (2120646).

Almost surely, 2^20091455 is an apocalyptic number.

20091455 is a deficient number, since it is larger than the sum of its proper divisors (5356297).

20091455 is a wasteful number, since it uses less digits than its factorization.

20091455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11174 (or 11155 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20091455 is about 4482.3492724240. The cubic root of 20091455 is about 271.8548777110.

The spelling of 20091455 in words is "twenty million, ninety-one thousand, four hundred fifty-five".