20207091 has 8 divisors (see below), whose sum is σ = 27000064. Its totient is φ = 13442760.

The previous prime is 20207081. The next prime is 20207093. The reversal of 20207091 is 19070202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20207091 - 2⁵ = 20207059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20207093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5455 + ... + 8376.

It is an arithmetic number, because the mean of its divisors is an integer number (3375008).

Almost surely, 2^20207091 is an apocalyptic number.

20207091 is a deficient number, since it is larger than the sum of its proper divisors (6792973).

20207091 is a wasteful number, since it uses less digits than its factorization.

20207091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14321.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20207091 is about 4495.2298050267. The cubic root of 20207091 is about 272.3754322214.

Adding to 20207091 its reverse (19070202), we get a palindrome (39277293).

The spelling of 20207091 in words is "twenty million, two hundred seven thousand, ninety-one".