21655000

素因数分解:

$2^3\times 5^4\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:158

約数の個数: 80

約数和(自身を含む): 52295760

約数和(自身を除く): 30640760

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 61, 71, 100, 122, 125, 142, 200, 244, 250, 284, 305, 355, 488, 500, 568, 610, 625, 710, 1000, 1220, 1250, 1420, 1525, 1775, 2440, 2500, 2840, 3050, 3550, 4331, 5000, 6100, 7100, 7625, 8662, 8875, 12200, 14200, 15250, 17324, 17750, 21655, 30500, 34648, 35500, 38125, 43310, 44375, 61000, 71000, 76250, 86620, 88750, 108275, 152500, 173240, 177500, 216550, 305000, 355000, 433100, 541375, 866200, 1082750, 2165500, 2706875, 4331000, 5413750, 10827500, 21655000]

約数ペア:

[(1, 21655000), (2, 10827500), (4, 5413750), (5, 4331000), (8, 2706875), (10, 2165500), (20, 1082750), (25, 866200), (40, 541375), (50, 433100), (61, 355000), (71, 305000), (100, 216550), (122, 177500), (125, 173240), (142, 152500), (200, 108275), (244, 88750), (250, 86620), (284, 76250), (305, 71000), (355, 61000), (488, 44375), (500, 43310), (568, 38125), (610, 35500), (625, 34648), (710, 30500), (1000, 21655), (1220, 17750), (1250, 17324), (1420, 15250), (1525, 14200), (1775, 12200), (2440, 8875), (2500, 8662), (2840, 7625), (3050, 7100), (3550, 6100), (4331, 5000)]