20465661 has 8 divisors (see below), whose sum is σ = 27633280. Its totient is φ = 13470912.

The previous prime is 20465659. The next prime is 20465663. The reversal of 20465661 is 16656402.

It is an interprime number because it is at equal distance from previous prime (20465659) and next prime (20465663).

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

It is not a de Polignac number, because 20465661 - 2¹ = 20465659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20465663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42940 + ... + 43413.

It is an arithmetic number, because the mean of its divisors is an integer number (3454160).

Almost surely, 2^20465661 is an apocalyptic number.

It is an amenable number.

20465661 is a deficient number, since it is larger than the sum of its proper divisors (7167619).

20465661 is an equidigital number, since it uses as much as digits as its factorization.

20465661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86435.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 20465661 is about 4523.8988715487. The cubic root of 20465661 is about 273.5322840993.

The spelling of 20465661 in words is "twenty million, four hundred sixty-five thousand, six hundred sixty-one".