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20695431 = 350913553
BaseRepresentation
bin100111011110…
…0100110000111
31102221102210110
41032330212013
520244223211
62015324103
7340623351
oct116744607
942842713
1020695431
1110755869
126b20633
134397b23
142a6a0d1
151c3bea6
hex13bc987

20695431 has 8 divisors (see below), whose sum is σ = 27650160. Its totient is φ = 13768832.

The previous prime is 20695399. The next prime is 20695453. The reversal of 20695431 is 13459602.

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 20695431 - 25 = 20695399 is a prime.

It is a super-2 number, since 2×206954312 = 856601728551522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20695231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5250 + ... + 8303.

It is an arithmetic number, because the mean of its divisors is an integer number (3456270).

Almost surely, 220695431 is an apocalyptic number.

20695431 is a deficient number, since it is larger than the sum of its proper divisors (6954729).

20695431 is a wasteful number, since it uses less digits than its factorization.

20695431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14065.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20695431 is about 4549.2231204899. The cubic root of 20695431 is about 274.5521349146.

The spelling of 20695431 in words is "twenty million, six hundred ninety-five thousand, four hundred thirty-one".

Divisors: 1 3 509 1527 13553 40659 6898477 20695431