20521411 has 8 divisors (see below), whose sum is σ = 21392384. Its totient is φ = 19663560.

The previous prime is 20521409. The next prime is 20521429. The reversal of 20521411 is 11412502.

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

It is a cyclic number.

It is not a de Polignac number, because 20521411 - 2¹ = 20521409 is a prime.

It is a super-2 number, since 2×20521411² = 842256618861842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20521811) 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, 21 + ... + 6406.

It is an arithmetic number, because the mean of its divisors is an integer number (2674048).

Almost surely, 2^20521411 is an apocalyptic number.

20521411 is a deficient number, since it is larger than the sum of its proper divisors (870973).

20521411 is a wasteful number, since it uses less digits than its factorization.

20521411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6561.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 20521411 is about 4530.0564014149. The cubic root of 20521411 is about 273.7804330823.

Adding to 20521411 its reverse (11412502), we get a palindrome (31933913).

The spelling of 20521411 in words is "twenty million, five hundred twenty-one thousand, four hundred eleven".