20072261 has 8 divisors (see below), whose sum is σ = 22849344. Its totient is φ = 17453920.

The previous prime is 20072209. The next prime is 20072267. The reversal of 20072261 is 16227002.

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

It is not a de Polignac number, because 20072261 - 2²² = 15877957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20072267) 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 7 ways as a sum of consecutive naturals, for example, 39416 + ... + 39921.

It is an arithmetic number, because the mean of its divisors is an integer number (2856168).

Almost surely, 2^20072261 is an apocalyptic number.

It is an amenable number.

20072261 is a deficient number, since it is larger than the sum of its proper divisors (2777083).

20072261 is a wasteful number, since it uses less digits than its factorization.

20072261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79371.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 20072261 is about 4480.2076960784. The cubic root of 20072261 is about 271.7682796184.

Adding to 20072261 its reverse (16227002), we get a palindrome (36299263).

The spelling of 20072261 in words is "twenty million, seventy-two thousand, two hundred sixty-one".