21141760

素因数分解:

$2^8\times 5^1\times {\mathrm{83}}^1\times {\mathrm{199}}^1$

素因数の和:303

約数の個数: 72

約数和(自身を含む): 51508800

約数和(自身を除く): 30367040

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 83, 128, 160, 166, 199, 256, 320, 332, 398, 415, 640, 664, 796, 830, 995, 1280, 1328, 1592, 1660, 1990, 2656, 3184, 3320, 3980, 5312, 6368, 6640, 7960, 10624, 12736, 13280, 15920, 16517, 21248, 25472, 26560, 31840, 33034, 50944, 53120, 63680, 66068, 82585, 106240, 127360, 132136, 165170, 254720, 264272, 330340, 528544, 660680, 1057088, 1321360, 2114176, 2642720, 4228352, 5285440, 10570880, 21141760]

約数ペア:

[(1, 21141760), (2, 10570880), (4, 5285440), (5, 4228352), (8, 2642720), (10, 2114176), (16, 1321360), (20, 1057088), (32, 660680), (40, 528544), (64, 330340), (80, 264272), (83, 254720), (128, 165170), (160, 132136), (166, 127360), (199, 106240), (256, 82585), (320, 66068), (332, 63680), (398, 53120), (415, 50944), (640, 33034), (664, 31840), (796, 26560), (830, 25472), (995, 21248), (1280, 16517), (1328, 15920), (1592, 13280), (1660, 12736), (1990, 10624), (2656, 7960), (3184, 6640), (3320, 6368), (3980, 5312)]