20545417 has 8 divisors (see below), whose sum is σ = 21498624. Its totient is φ = 19597248.

The previous prime is 20545411. The next prime is 20545423. The reversal of 20545417 is 71454502.

It is an interprime number because it is at equal distance from previous prime (20545411) and next prime (20545423).

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 20545417 - 2³ = 20545409 is a prime.

It is a super-2 number, since 2×20545417² = 844228319407778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545411) 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, 8928 + ... + 10990.

It is an arithmetic number, because the mean of its divisors is an integer number (2687328).

Almost surely, 2^20545417 is an apocalyptic number.

It is an amenable number.

20545417 is a deficient number, since it is larger than the sum of its proper divisors (953207).

20545417 is a wasteful number, since it uses less digits than its factorization.

20545417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 20545417 is about 4532.7052628646. The cubic root of 20545417 is about 273.8871478358.

Adding to 20545417 its reverse (71454502), we get a palindrome (91999919).

The spelling of 20545417 in words is "twenty million, five hundred forty-five thousand, four hundred seventeen".