20661410 has 32 divisors (see below), whose sum is σ = 46369152. Its totient is φ = 6439680.

The previous prime is 20661401. The next prime is 20661419. The reversal of 20661410 is 1416602.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20661401) and next prime (20661419).

It is not an unprimeable number, because it can be changed into a prime (20661419) 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 15 ways as a sum of consecutive naturals, for example, 12647 + ... + 14186.

It is an arithmetic number, because the mean of its divisors is an integer number (1449036).

Almost surely, 2^20661410 is an apocalyptic number.

20661410 is an abundant number, since it is smaller than the sum of its proper divisors (25707742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20661410 is a wasteful number, since it uses less digits than its factorization.

20661410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26858.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20661410 is about 4545.4823726421. The cubic root of 20661410 is about 274.4016079515.

It can be divided in two parts, 206 and 61410, that added together give a palindrome (61616).

The spelling of 20661410 in words is "twenty million, six hundred sixty-one thousand, four hundred ten".