20261697 has 8 divisors (see below), whose sum is σ = 27144480. Its totient is φ = 13443360.

The previous prime is 20261687. The next prime is 20261701. The reversal of 20261697 is 79616202.

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

It is not a de Polignac number, because 20261697 - 2¹¹ = 20259649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20261617) 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, 15372 + ... + 16637.

It is an arithmetic number, because the mean of its divisors is an integer number (3393060).

Almost surely, 2^20261697 is an apocalyptic number.

It is an amenable number.

20261697 is a deficient number, since it is larger than the sum of its proper divisors (6882783).

20261697 is a wasteful number, since it uses less digits than its factorization.

20261697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32223.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20261697 is about 4501.2994790394. The cubic root of 20261697 is about 272.6205599579.

Adding to 20261697 its reverse (79616202), we get a palindrome (99877899).

The spelling of 20261697 in words is "twenty million, two hundred sixty-one thousand, six hundred ninety-seven".