20702305 has 16 divisors (see below), whose sum is σ = 28163520. Its totient is φ = 14482368.

The previous prime is 20702303. The next prime is 20702329. The reversal of 20702305 is 50320702.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20702305 - 2¹ = 20702303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (20702303) 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 15 ways as a sum of consecutive naturals, for example, 7147 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (1760220).

Almost surely, 2^20702305 is an apocalyptic number.

It is an amenable number.

20702305 is a deficient number, since it is larger than the sum of its proper divisors (7461215).

20702305 is a wasteful number, since it uses less digits than its factorization.

20702305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16800.

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20702305 is about 4549.9785713781. The cubic root of 20702305 is about 274.5825291026.

The spelling of 20702305 in words is "twenty million, seven hundred two thousand, three hundred five".