20925705 has 8 divisors (see below), whose sum is σ = 33481152. Its totient is φ = 11160368.

The previous prime is 20925701. The next prime is 20925739. The reversal of 20925705 is 50752902.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20925705 - 2² = 20925701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20925701) 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 7 ways as a sum of consecutive naturals, for example, 697509 + ... + 697538.

It is an arithmetic number, because the mean of its divisors is an integer number (4185144).

Almost surely, 2^20925705 is an apocalyptic number.

It is an amenable number.

20925705 is a deficient number, since it is larger than the sum of its proper divisors (12555447).

20925705 is a wasteful number, since it uses less digits than its factorization.

20925705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395055.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 20925705 is about 4574.4622634797. The cubic root of 20925705 is about 275.5666772077.

The spelling of 20925705 in words is "twenty million, nine hundred twenty-five thousand, seven hundred five".