20413511 has 2 divisors, whose sum is σ = 20413512. Its totient is φ = 20413510.

The previous prime is 20413499. The next prime is 20413537. The reversal of 20413511 is 11531402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20413511 is a prime.

It is a super-2 number, since 2×20413511² = 833422862694242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20413511.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20413571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206755 + 10206756.

It is an arithmetic number, because the mean of its divisors is an integer number (10206756).

Almost surely, 2^20413511 is an apocalyptic number.

20413511 is a deficient number, since it is larger than the sum of its proper divisors (1).

20413511 is an equidigital number, since it uses as much as digits as its factorization.

20413511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 20413511 is about 4518.1313615255. The cubic root of 20413511 is about 273.2997508150.

Adding to 20413511 its reverse (11531402), we get a palindrome (31944913).

The spelling of 20413511 in words is "twenty million, four hundred thirteen thousand, five hundred eleven".