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20726707 = 139149113
BaseRepresentation
bin100111100010…
…0001110110011
31110000000200211
41033010032303
520301223312
62020124551
7341113501
oct117041663
943000624
1020726707
1110777311
126b36757
1343a9131
142a77671
151c463a7
hex13c43b3

20726707 has 4 divisors (see below), whose sum is σ = 20875960. Its totient is φ = 20577456.

The previous prime is 20726683. The next prime is 20726711. The reversal of 20726707 is 70762702.

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 20726707 - 27 = 20726579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20726737) 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 3 ways as a sum of consecutive naturals, for example, 74418 + ... + 74695.

It is an arithmetic number, because the mean of its divisors is an integer number (5218990).

Almost surely, 220726707 is an apocalyptic number.

20726707 is a deficient number, since it is larger than the sum of its proper divisors (149253).

20726707 is a wasteful number, since it uses less digits than its factorization.

20726707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149252.

The product of its (nonzero) digits is 8232, while the sum is 31.

The square root of 20726707 is about 4552.6593327417. The cubic root of 20726707 is about 274.6903710716.

The spelling of 20726707 in words is "twenty million, seven hundred twenty-six thousand, seven hundred seven".

Divisors: 1 139 149113 20726707