21396280

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{599}}^1$

素因数の和:676

約数の個数: 64

約数和(自身を含む): 51840000

約数和(自身を除く): 30443720

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 47, 76, 94, 95, 152, 188, 190, 235, 376, 380, 470, 599, 760, 893, 940, 1198, 1786, 1880, 2396, 2995, 3572, 4465, 4792, 5990, 7144, 8930, 11381, 11980, 17860, 22762, 23960, 28153, 35720, 45524, 56306, 56905, 91048, 112612, 113810, 140765, 225224, 227620, 281530, 455240, 534907, 563060, 1069814, 1126120, 2139628, 2674535, 4279256, 5349070, 10698140, 21396280]

約数ペア:

[(1, 21396280), (2, 10698140), (4, 5349070), (5, 4279256), (8, 2674535), (10, 2139628), (19, 1126120), (20, 1069814), (38, 563060), (40, 534907), (47, 455240), (76, 281530), (94, 227620), (95, 225224), (152, 140765), (188, 113810), (190, 112612), (235, 91048), (376, 56905), (380, 56306), (470, 45524), (599, 35720), (760, 28153), (893, 23960), (940, 22762), (1198, 17860), (1786, 11980), (1880, 11381), (2396, 8930), (2995, 7144), (3572, 5990), (4465, 4792)]