20545601 has 8 divisors (see below), whose sum is σ = 22178880. Its totient is φ = 18974032.

The previous prime is 20545597. The next prime is 20545607. The reversal of 20545601 is 10654502.

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 20545601 - 2² = 20545597 is a prime.

It is a super-3 number, since 3×20545601³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20545607) 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, 14735 + ... + 16068.

It is an arithmetic number, because the mean of its divisors is an integer number (2772360).

Almost surely, 2^20545601 is an apocalyptic number.

It is an amenable number.

20545601 is a deficient number, since it is larger than the sum of its proper divisors (1633279).

20545601 is a wasteful number, since it uses less digits than its factorization.

20545601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30855.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20545601 is about 4532.7255597488. The cubic root of 20545601 is about 273.8879654567.

The spelling of 20545601 in words is "twenty million, five hundred forty-five thousand, six hundred one".