19900100

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{79}}^1\times {\mathrm{229}}^1$

素因数の和:333

約数の個数: 72

約数和(自身を含む): 47913600

約数和(自身を除く): 28013500

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 44, 50, 55, 79, 100, 110, 158, 220, 229, 275, 316, 395, 458, 550, 790, 869, 916, 1100, 1145, 1580, 1738, 1975, 2290, 2519, 3476, 3950, 4345, 4580, 5038, 5725, 7900, 8690, 10076, 11450, 12595, 17380, 18091, 21725, 22900, 25190, 36182, 43450, 50380, 62975, 72364, 86900, 90455, 125950, 180910, 199001, 251900, 361820, 398002, 452275, 796004, 904550, 995005, 1809100, 1990010, 3980020, 4975025, 9950050, 19900100]

約数ペア:

[(1, 19900100), (2, 9950050), (4, 4975025), (5, 3980020), (10, 1990010), (11, 1809100), (20, 995005), (22, 904550), (25, 796004), (44, 452275), (50, 398002), (55, 361820), (79, 251900), (100, 199001), (110, 180910), (158, 125950), (220, 90455), (229, 86900), (275, 72364), (316, 62975), (395, 50380), (458, 43450), (550, 36182), (790, 25190), (869, 22900), (916, 21725), (1100, 18091), (1145, 17380), (1580, 12595), (1738, 11450), (1975, 10076), (2290, 8690), (2519, 7900), (3476, 5725), (3950, 5038), (4345, 4580)]