20000487 has 32 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 11692800.

The previous prime is 20000471. The next prime is 20000503. The reversal of 20000487 is 78400002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20000471) and next prime (20000503).

It is not a de Polignac number, because 20000487 - 2⁴ = 20000471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85723 + ... + 85955.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^20000487 is an apocalyptic number.

20000487 is a deficient number, since it is larger than the sum of its proper divisors (10191129).

20000487 is a wasteful number, since it uses less digits than its factorization.

20000487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20000487 is about 4472.1904029234. The cubic root of 20000487 is about 271.4439648439.

Adding to 20000487 its reverse (78400002), we get a palindrome (98400489).

The spelling of 20000487 in words is "twenty million, four hundred eighty-seven", and thus it is an aban number.