20291445 has 64 divisors (see below), whose sum is σ = 38361600. Its totient is φ = 10160640.

The previous prime is 20291443. The next prime is 20291471. The reversal of 20291445 is 54419202.

It is not a de Polignac number, because 20291445 - 2¹ = 20291443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20291443) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 277929 + ... + 278001.

It is an arithmetic number, because the mean of its divisors is an integer number (599400).

Almost surely, 2^20291445 is an apocalyptic number.

It is an amenable number.

20291445 is a deficient number, since it is larger than the sum of its proper divisors (18070155).

20291445 is a wasteful number, since it uses less digits than its factorization.

20291445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20291445 is about 4504.6026461831. The cubic root of 20291445 is about 272.7539142156.

It can be divided in two parts, 20291 and 445, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20291445 in words is "twenty million, two hundred ninety-one thousand, four hundred forty-five".