20890935

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{41}}^1\times {\mathrm{67}}^1$

素因数の和:145

約数の個数: 72

約数和(自身を含む): 40766544

約数和(自身を除く): 19875609

約数列:

[1, 3, 5, 9, 13, 15, 39, 41, 45, 65, 67, 117, 123, 169, 195, 201, 205, 335, 369, 507, 533, 585, 603, 615, 845, 871, 1005, 1521, 1599, 1845, 2535, 2613, 2665, 2747, 3015, 4355, 4797, 6929, 7605, 7839, 7995, 8241, 11323, 13065, 13735, 20787, 23985, 24723, 33969, 34645, 35711, 39195, 41205, 56615, 62361, 101907, 103935, 107133, 123615, 169845, 178555, 311805, 321399, 464243, 509535, 535665, 1392729, 1606995, 2321215, 4178187, 6963645, 20890935]

約数ペア:

[(1, 20890935), (3, 6963645), (5, 4178187), (9, 2321215), (13, 1606995), (15, 1392729), (39, 535665), (41, 509535), (45, 464243), (65, 321399), (67, 311805), (117, 178555), (123, 169845), (169, 123615), (195, 107133), (201, 103935), (205, 101907), (335, 62361), (369, 56615), (507, 41205), (533, 39195), (585, 35711), (603, 34645), (615, 33969), (845, 24723), (871, 23985), (1005, 20787), (1521, 13735), (1599, 13065), (1845, 11323), (2535, 8241), (2613, 7995), (2665, 7839), (2747, 7605), (3015, 6929), (4355, 4797)]