20001465 has 32 divisors (see below), whose sum is σ = 38793600. Its totient is φ = 9696960.

The previous prime is 20001451. The next prime is 20001491. The reversal of 20001465 is 56410002.

It is a happy number.

20001465 is a `hidden beast` number, since 200 + 0 + 1 + 465 = 666.

It is not a de Polignac number, because 20001465 - 2¹³ = 19993273 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5250 + ... + 8219.

It is an arithmetic number, because the mean of its divisors is an integer number (1212300).

Almost surely, 2^20001465 is an apocalyptic number.

It is an amenable number.

20001465 is a deficient number, since it is larger than the sum of its proper divisors (18792135).

20001465 is a wasteful number, since it uses less digits than its factorization.

20001465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13494 (or 13488 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20001465 is about 4472.2997439796. The cubic root of 20001465 is about 271.4483892007.

Adding to 20001465 its reverse (56410002), we get a palindrome (76411467).

The spelling of 20001465 in words is "twenty million, one thousand, four hundred sixty-five".