20400900

素因数分解:

$2^2\times 3^1\times 5^2\times {\mathrm{13}}^1\times {\mathrm{5231}}^1$

素因数の和:5261

約数の個数: 72

約数和(自身を含む): 63579264

約数和(自身を除く): 43178364

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 25, 26, 30, 39, 50, 52, 60, 65, 75, 78, 100, 130, 150, 156, 195, 260, 300, 325, 390, 650, 780, 975, 1300, 1950, 3900, 5231, 10462, 15693, 20924, 26155, 31386, 52310, 62772, 68003, 78465, 104620, 130775, 136006, 156930, 204009, 261550, 272012, 313860, 340015, 392325, 408018, 523100, 680030, 784650, 816036, 1020045, 1360060, 1569300, 1700075, 2040090, 3400150, 4080180, 5100225, 6800300, 10200450, 20400900]

約数ペア:

[(1, 20400900), (2, 10200450), (3, 6800300), (4, 5100225), (5, 4080180), (6, 3400150), (10, 2040090), (12, 1700075), (13, 1569300), (15, 1360060), (20, 1020045), (25, 816036), (26, 784650), (30, 680030), (39, 523100), (50, 408018), (52, 392325), (60, 340015), (65, 313860), (75, 272012), (78, 261550), (100, 204009), (130, 156930), (150, 136006), (156, 130775), (195, 104620), (260, 78465), (300, 68003), (325, 62772), (390, 52310), (650, 31386), (780, 26155), (975, 20924), (1300, 15693), (1950, 10462), (3900, 5231)]