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20710813 = 107193559
BaseRepresentation
bin100111100000…
…0010110011101
31102222012220011
41033000112131
520300221223
62015523221
7341016244
oct117002635
942865804
1020710813
1110766382
126b29511
1343a1b26
142a7195b
151c4180d
hex13c059d

20710813 has 4 divisors (see below), whose sum is σ = 20904480. Its totient is φ = 20517148.

The previous prime is 20710793. The next prime is 20710831. The reversal of 20710813 is 31801702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20710813 - 213 = 20702621 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 (20710853) 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, 96673 + ... + 96886.

It is an arithmetic number, because the mean of its divisors is an integer number (5226120).

Almost surely, 220710813 is an apocalyptic number.

It is an amenable number.

20710813 is a deficient number, since it is larger than the sum of its proper divisors (193667).

20710813 is a wasteful number, since it uses less digits than its factorization.

20710813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193666.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 20710813 is about 4550.9134247973. The cubic root of 20710813 is about 274.6201388954.

The spelling of 20710813 in words is "twenty million, seven hundred ten thousand, eight hundred thirteen".

Divisors: 1 107 193559 20710813