20807470 has 32 divisors (see below), whose sum is σ = 39866400. Its totient is φ = 7796736.

The previous prime is 20807447. The next prime is 20807483. The reversal of 20807470 is 7470802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17866 + ... + 18994.

It is an arithmetic number, because the mean of its divisors is an integer number (1245825).

Almost surely, 2^20807470 is an apocalyptic number.

20807470 is a deficient number, since it is larger than the sum of its proper divisors (19058930).

20807470 is a wasteful number, since it uses less digits than its factorization.

20807470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 20807470 is about 4561.5205798067. The cubic root of 20807470 is about 275.0466917963.

The spelling of 20807470 in words is "twenty million, eight hundred seven thousand, four hundred seventy".