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20564407 = 171209671
BaseRepresentation
bin100111001110…
…0100110110111
31102200210001201
41032130212313
520231030112
62012433331
7336536353
oct116344667
942623051
1020564407
1110676386
126a78847
1343502b6
142a34463
151c13257
hex139c9b7

20564407 has 4 divisors (see below), whose sum is σ = 21774096. Its totient is φ = 19354720.

The previous prime is 20564399. The next prime is 20564431. The reversal of 20564407 is 70446502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20564407 - 23 = 20564399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 604819 + ... + 604852.

It is an arithmetic number, because the mean of its divisors is an integer number (5443524).

Almost surely, 220564407 is an apocalyptic number.

20564407 is a deficient number, since it is larger than the sum of its proper divisors (1209689).

20564407 is a wasteful number, since it uses less digits than its factorization.

20564407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209688.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 20564407 is about 4534.7995545559. The cubic root of 20564407 is about 273.9715059079.

The spelling of 20564407 in words is "twenty million, five hundred sixty-four thousand, four hundred seven".

Divisors: 1 17 1209671 20564407