20804487 has 16 divisors (see below), whose sum is σ = 31854720. Its totient is φ = 11944800.

The previous prime is 20804479. The next prime is 20804501. The reversal of 20804487 is 78440802.

It is not a de Polignac number, because 20804487 - 2³ = 20804479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804437) 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, 15964 + ... + 17217.

It is an arithmetic number, because the mean of its divisors is an integer number (1990920).

Almost surely, 2^20804487 is an apocalyptic number.

20804487 is a deficient number, since it is larger than the sum of its proper divisors (11050233).

20804487 is a wasteful number, since it uses less digits than its factorization.

20804487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33214.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 20804487 is about 4561.1935937866. The cubic root of 20804487 is about 275.0335474225.

The spelling of 20804487 in words is "twenty million, eight hundred four thousand, four hundred eighty-seven".