20653361 has 4 divisors (see below), whose sum is σ = 21740400. Its totient is φ = 19566324.

The previous prime is 20653357. The next prime is 20653387. The reversal of 20653361 is 16335602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20653361 - 2² = 20653357 is a prime.

It is a super-2 number, since 2×20653361² = 853122641192642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20653361.

It is not an unprimeable number, because it can be changed into a prime (20653331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543491 + ... + 543528.

It is an arithmetic number, because the mean of its divisors is an integer number (5435100).

Almost surely, 2^20653361 is an apocalyptic number.

It is an amenable number.

20653361 is a deficient number, since it is larger than the sum of its proper divisors (1087039).

20653361 is a wasteful number, since it uses less digits than its factorization.

20653361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087038.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20653361 is about 4544.5969018165. The cubic root of 20653361 is about 274.3659707353.

Adding to 20653361 its reverse (16335602), we get a palindrome (36988963).

The spelling of 20653361 in words is "twenty million, six hundred fifty-three thousand, three hundred sixty-one".