21450040

素因数分解:

$2^3\times 5^1\times {\mathrm{59}}^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 50220000

約数和(自身を除く): 28769960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 59, 61, 118, 122, 149, 236, 244, 295, 298, 305, 472, 488, 590, 596, 610, 745, 1180, 1192, 1220, 1490, 2360, 2440, 2980, 3599, 5960, 7198, 8791, 9089, 14396, 17582, 17995, 18178, 28792, 35164, 35990, 36356, 43955, 45445, 70328, 71980, 72712, 87910, 90890, 143960, 175820, 181780, 351640, 363560, 536251, 1072502, 2145004, 2681255, 4290008, 5362510, 10725020, 21450040]

約数ペア:

[(1, 21450040), (2, 10725020), (4, 5362510), (5, 4290008), (8, 2681255), (10, 2145004), (20, 1072502), (40, 536251), (59, 363560), (61, 351640), (118, 181780), (122, 175820), (149, 143960), (236, 90890), (244, 87910), (295, 72712), (298, 71980), (305, 70328), (472, 45445), (488, 43955), (590, 36356), (596, 35990), (610, 35164), (745, 28792), (1180, 18178), (1192, 17995), (1220, 17582), (1490, 14396), (2360, 9089), (2440, 8791), (2980, 7198), (3599, 5960)]