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20387693 is a prime number
BaseRepresentation
bin100110111000…
…1011101101101
31102100210122202
41031301131231
520204401233
62004551245
7335202224
oct115613555
942323582
1020387693
1110565637
1269b2525
1342baa31
1429c9cbb
151bcabe8
hex137176d

20387693 has 2 divisors, whose sum is σ = 20387694. Its totient is φ = 20387692.

The previous prime is 20387681. The next prime is 20387699. The reversal of 20387693 is 39678302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15665764 + 4721929 = 3958^2 + 2173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20387693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20387699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193846 + 10193847.

It is an arithmetic number, because the mean of its divisors is an integer number (10193847).

Almost surely, 220387693 is an apocalyptic number.

It is an amenable number.

20387693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387693 is an equidigital number, since it uses as much as digits as its factorization.

20387693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20387693 is about 4515.2733029131. The cubic root of 20387693 is about 273.1844835332.

The spelling of 20387693 in words is "twenty million, three hundred eighty-seven thousand, six hundred ninety-three".