21815320

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{241}}^1$

素因数の和:356

約数の個数: 64

約数和(自身を含む): 51575040

約数和(自身を除く): 29759720

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 73, 124, 146, 155, 241, 248, 292, 310, 365, 482, 584, 620, 730, 964, 1205, 1240, 1460, 1928, 2263, 2410, 2920, 4526, 4820, 7471, 9052, 9640, 11315, 14942, 17593, 18104, 22630, 29884, 35186, 37355, 45260, 59768, 70372, 74710, 87965, 90520, 140744, 149420, 175930, 298840, 351860, 545383, 703720, 1090766, 2181532, 2726915, 4363064, 5453830, 10907660, 21815320]

約数ペア:

[(1, 21815320), (2, 10907660), (4, 5453830), (5, 4363064), (8, 2726915), (10, 2181532), (20, 1090766), (31, 703720), (40, 545383), (62, 351860), (73, 298840), (124, 175930), (146, 149420), (155, 140744), (241, 90520), (248, 87965), (292, 74710), (310, 70372), (365, 59768), (482, 45260), (584, 37355), (620, 35186), (730, 29884), (964, 22630), (1205, 18104), (1240, 17593), (1460, 14942), (1928, 11315), (2263, 9640), (2410, 9052), (2920, 7471), (4526, 4820)]