20361645 has 16 divisors (see below), whose sum is σ = 36198720. Its totient is φ = 10859472.

The previous prime is 20361641. The next prime is 20361659. The reversal of 20361645 is 54616302.

20361645 is a `hidden beast` number, since 2 + 0 + 3 + 616 + 45 = 666.

It is not a de Polignac number, because 20361645 - 2² = 20361641 is a prime.

It is a super-3 number, since 3×20361645³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75279 + ... + 75548.

It is an arithmetic number, because the mean of its divisors is an integer number (2262420).

Almost surely, 2^20361645 is an apocalyptic number.

It is an amenable number.

20361645 is a deficient number, since it is larger than the sum of its proper divisors (15837075).

20361645 is a wasteful number, since it uses less digits than its factorization.

20361645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150841 (or 150835 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20361645 is about 4512.3879487473. The cubic root of 20361645 is about 273.0680907321.

Adding to 20361645 its reverse (54616302), we get a palindrome (74977947).

The spelling of 20361645 in words is "twenty million, three hundred sixty-one thousand, six hundred forty-five".