21505545

素因数分解:

$3^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1\times {\mathrm{127}}^1$

素因数の和:262

約数の個数: 48

約数和(自身を含む): 38817792

約数和(自身を除く): 17312247

約数列:

[1, 3, 5, 9, 15, 45, 53, 71, 127, 159, 213, 265, 355, 381, 477, 635, 639, 795, 1065, 1143, 1905, 2385, 3195, 3763, 5715, 6731, 9017, 11289, 18815, 20193, 27051, 33655, 33867, 45085, 56445, 60579, 81153, 100965, 135255, 169335, 302895, 405765, 477901, 1433703, 2389505, 4301109, 7168515, 21505545]

約数ペア:

[(1, 21505545), (3, 7168515), (5, 4301109), (9, 2389505), (15, 1433703), (45, 477901), (53, 405765), (71, 302895), (127, 169335), (159, 135255), (213, 100965), (265, 81153), (355, 60579), (381, 56445), (477, 45085), (635, 33867), (639, 33655), (795, 27051), (1065, 20193), (1143, 18815), (1905, 11289), (2385, 9017), (3195, 6731), (3763, 5715)]