20653331 has 2 divisors, whose sum is σ = 20653332. Its totient is φ = 20653330.

The previous prime is 20653309. The next prime is 20653357. The reversal of 20653331 is 13335602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20653331 - 2⁶ = 20653267 is a prime.

It is a super-2 number, since 2×20653331² = 853120162791122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20653297 and 20653306.

It is not a weakly prime, because it can be changed into another prime (20656331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10326665 + 10326666.

It is an arithmetic number, because the mean of its divisors is an integer number (10326666).

Almost surely, 2^20653331 is an apocalyptic number.

20653331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653331 is an equidigital number, since it uses as much as digits as its factorization.

20653331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 20653331 is about 4544.5936011925. The cubic root of 20653331 is about 274.3658378919.

Adding to 20653331 its reverse (13335602), we get a palindrome (33988933).

The spelling of 20653331 in words is "twenty million, six hundred fifty-three thousand, three hundred thirty-one".