20150000

素因数分解:

$2^4\times 5^5\times {\mathrm{13}}^1\times {\mathrm{31}}^1$

素因数の和:77

約数の個数: 120

約数和(自身を含む): 54246528

約数和(自身を除く): 34096528

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 25, 26, 31, 40, 50, 52, 62, 65, 80, 100, 104, 124, 125, 130, 155, 200, 208, 248, 250, 260, 310, 325, 400, 403, 496, 500, 520, 620, 625, 650, 775, 806, 1000, 1040, 1240, 1250, 1300, 1550, 1612, 1625, 2000, 2015, 2480, 2500, 2600, 3100, 3125, 3224, 3250, 3875, 4030, 5000, 5200, 6200, 6250, 6448, 6500, 7750, 8060, 8125, 10000, 10075, 12400, 12500, 13000, 15500, 16120, 16250, 19375, 20150, 25000, 26000, 31000, 32240, 32500, 38750, 40300, 40625, 50000, 50375, 62000, 65000, 77500, 80600, 81250, 96875, 100750, 130000, 155000, 161200, 162500, 193750, 201500, 251875, 310000, 325000, 387500, 403000, 503750, 650000, 775000, 806000, 1007500, 1259375, 1550000, 2015000, 2518750, 4030000, 5037500, 10075000, 20150000]

約数ペア:

[(1, 20150000), (2, 10075000), (4, 5037500), (5, 4030000), (8, 2518750), (10, 2015000), (13, 1550000), (16, 1259375), (20, 1007500), (25, 806000), (26, 775000), (31, 650000), (40, 503750), (50, 403000), (52, 387500), (62, 325000), (65, 310000), (80, 251875), (100, 201500), (104, 193750), (124, 162500), (125, 161200), (130, 155000), (155, 130000), (200, 100750), (208, 96875), (248, 81250), (250, 80600), (260, 77500), (310, 65000), (325, 62000), (400, 50375), (403, 50000), (496, 40625), (500, 40300), (520, 38750), (620, 32500), (625, 32240), (650, 31000), (775, 26000), (806, 25000), (1000, 20150), (1040, 19375), (1240, 16250), (1250, 16120), (1300, 15500), (1550, 13000), (1612, 12500), (1625, 12400), (2000, 10075), (2015, 10000), (2480, 8125), (2500, 8060), (2600, 7750), (3100, 6500), (3125, 6448), (3224, 6250), (3250, 6200), (3875, 5200), (4030, 5000)]