20991750

素因数分解:

$2^1\times 3^1\times 5^3\times {\mathrm{13}}^1\times {\mathrm{2153}}^1$

素因数の和:2186

約数の個数: 64

約数和(自身を含む): 56452032

約数和(自身を除く): 35460282

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 25, 26, 30, 39, 50, 65, 75, 78, 125, 130, 150, 195, 250, 325, 375, 390, 650, 750, 975, 1625, 1950, 2153, 3250, 4306, 4875, 6459, 9750, 10765, 12918, 21530, 27989, 32295, 53825, 55978, 64590, 83967, 107650, 139945, 161475, 167934, 269125, 279890, 322950, 419835, 538250, 699725, 807375, 839670, 1399450, 1614750, 2099175, 3498625, 4198350, 6997250, 10495875, 20991750]

約数ペア:

[(1, 20991750), (2, 10495875), (3, 6997250), (5, 4198350), (6, 3498625), (10, 2099175), (13, 1614750), (15, 1399450), (25, 839670), (26, 807375), (30, 699725), (39, 538250), (50, 419835), (65, 322950), (75, 279890), (78, 269125), (125, 167934), (130, 161475), (150, 139945), (195, 107650), (250, 83967), (325, 64590), (375, 55978), (390, 53825), (650, 32295), (750, 27989), (975, 21530), (1625, 12918), (1950, 10765), (2153, 9750), (3250, 6459), (4306, 4875)]