20645461 has 8 divisors (see below), whose sum is σ = 21526560. Its totient is φ = 19782672.

The previous prime is 20645453. The next prime is 20645483. The reversal of 20645461 is 16454602.

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

It is a cyclic number.

It is not a de Polignac number, because 20645461 - 2³ = 20645453 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 (20645441) 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, 2251 + ... + 6808.

It is an arithmetic number, because the mean of its divisors is an integer number (2690820).

Almost surely, 2^20645461 is an apocalyptic number.

It is an amenable number.

20645461 is a deficient number, since it is larger than the sum of its proper divisors (881099).

20645461 is an equidigital number, since it uses as much as digits as its factorization.

20645461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20645461 is about 4543.7276546906. The cubic root of 20645461 is about 274.3309842168.

The spelling of 20645461 in words is "twenty million, six hundred forty-five thousand, four hundred sixty-one".