20521466 has 8 divisors (see below), whose sum is σ = 35179680. Its totient is φ = 8794908.

The previous prime is 20521453. The next prime is 20521489. The reversal of 20521466 is 66412502.

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

It is a super-2 number, since 2×20521466² = 842261133578312, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732896 + ... + 732923.

It is an arithmetic number, because the mean of its divisors is an integer number (4397460).

Almost surely, 2^20521466 is an apocalyptic number.

20521466 is a deficient number, since it is larger than the sum of its proper divisors (14658214).

20521466 is a wasteful number, since it uses less digits than its factorization.

20521466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465828.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20521466 is about 4530.0624719754. The cubic root of 20521466 is about 273.7806776709.

Adding to 20521466 its reverse (66412502), we get a palindrome (86933968).

The spelling of 20521466 in words is "twenty million, five hundred twenty-one thousand, four hundred sixty-six".