20856927 has 32 divisors (see below), whose sum is σ = 36037120. Its totient is φ = 10419840.

The previous prime is 20856919. The next prime is 20856947. The reversal of 20856927 is 72965802.

It is a happy number.

It is not a de Polignac number, because 20856927 - 2³ = 20856919 is a prime.

It is a super-2 number, since 2×20856927² = 870022807766658, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3177 + ... + 7197.

It is an arithmetic number, because the mean of its divisors is an integer number (1126160).

Almost surely, 2^20856927 is an apocalyptic number.

20856927 is a deficient number, since it is larger than the sum of its proper divisors (15180193).

20856927 is a wasteful number, since it uses less digits than its factorization.

20856927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20856927 is about 4566.9384712299. The cubic root of 20856927 is about 275.2644376485.

The spelling of 20856927 in words is "twenty million, eight hundred fifty-six thousand, nine hundred twenty-seven".