20471553 has 12 divisors (see below), whose sum is σ = 31309668. Its totient is φ = 12844800.

The previous prime is 20471497. The next prime is 20471579. The reversal of 20471553 is 35517402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18558864 + 1912689 = 4308^2 + 1383^2 .

It is not a de Polignac number, because 20471553 - 2⁶ = 20471489 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20470553) 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 11 ways as a sum of consecutive naturals, for example, 66748 + ... + 67053.

It is an arithmetic number, because the mean of its divisors is an integer number (2609139).

Almost surely, 2^20471553 is an apocalyptic number.

It is an amenable number.

20471553 is a deficient number, since it is larger than the sum of its proper divisors (10838115).

20471553 is a wasteful number, since it uses less digits than its factorization.

20471553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133824 (or 133821 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20471553 is about 4524.5500328762. The cubic root of 20471553 is about 273.5585312779.

Adding to 20471553 its reverse (35517402), we get a palindrome (55988955).

It can be divided in two parts, 2047 and 1553, that added together give a square (3600 = 60²).

The spelling of 20471553 in words is "twenty million, four hundred seventy-one thousand, five hundred fifty-three".