20571490 has 16 divisors (see below), whose sum is σ = 38977920. Its totient is φ = 7795440.

The previous prime is 20571449. The next prime is 20571493. The reversal of 20571490 is 9417502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20571493) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53946 + ... + 54325.

It is an arithmetic number, because the mean of its divisors is an integer number (2436120).

Almost surely, 2^20571490 is an apocalyptic number.

20571490 is a deficient number, since it is larger than the sum of its proper divisors (18406430).

20571490 is a wasteful number, since it uses less digits than its factorization.

20571490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108297.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 20571490 is about 4535.5804479691. The cubic root of 20571490 is about 274.0029569717.

Adding to 20571490 its reverse (9417502), we get a palindrome (29988992).

The spelling of 20571490 in words is "twenty million, five hundred seventy-one thousand, four hundred ninety".