21301960

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{419}}^1$

素因数の和:502

約数の個数: 64

約数和(自身を含む): 50803200

約数和(自身を除く): 29501240

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 41, 62, 82, 124, 155, 164, 205, 248, 310, 328, 410, 419, 620, 820, 838, 1240, 1271, 1640, 1676, 2095, 2542, 3352, 4190, 5084, 6355, 8380, 10168, 12710, 12989, 16760, 17179, 25420, 25978, 34358, 50840, 51956, 64945, 68716, 85895, 103912, 129890, 137432, 171790, 259780, 343580, 519560, 532549, 687160, 1065098, 2130196, 2662745, 4260392, 5325490, 10650980, 21301960]

約数ペア:

[(1, 21301960), (2, 10650980), (4, 5325490), (5, 4260392), (8, 2662745), (10, 2130196), (20, 1065098), (31, 687160), (40, 532549), (41, 519560), (62, 343580), (82, 259780), (124, 171790), (155, 137432), (164, 129890), (205, 103912), (248, 85895), (310, 68716), (328, 64945), (410, 51956), (419, 50840), (620, 34358), (820, 25978), (838, 25420), (1240, 17179), (1271, 16760), (1640, 12989), (1676, 12710), (2095, 10168), (2542, 8380), (3352, 6355), (4190, 5084)]