20851704 has 24 divisors (see below), whose sum is σ = 56473560. Its totient is φ = 6950544.

The previous prime is 20851697. The next prime is 20851711. The reversal of 20851704 is 40715802.

It is an interprime number because it is at equal distance from previous prime (20851697) and next prime (20851711).

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144732 + ... + 144875.

It is an arithmetic number, because the mean of its divisors is an integer number (2353065).

Almost surely, 2^20851704 is an apocalyptic number.

20851704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20851704 is an abundant number, since it is smaller than the sum of its proper divisors (35621856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20851704 is a wasteful number, since it uses less digits than its factorization.

20851704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289619 (or 289612 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20851704 is about 4566.3666081470. The cubic root of 20851704 is about 275.2414584534.

The spelling of 20851704 in words is "twenty million, eight hundred fifty-one thousand, seven hundred four".