20305000

素因数分解:

$2^3\times 5^4\times {\mathrm{31}}^1\times {\mathrm{131}}^1$

素因数の和:188

約数の個数: 80

約数和(自身を含む): 49484160

約数和(自身を除く): 29179160

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 31, 40, 50, 62, 100, 124, 125, 131, 155, 200, 248, 250, 262, 310, 500, 524, 620, 625, 655, 775, 1000, 1048, 1240, 1250, 1310, 1550, 2500, 2620, 3100, 3275, 3875, 4061, 5000, 5240, 6200, 6550, 7750, 8122, 13100, 15500, 16244, 16375, 19375, 20305, 26200, 31000, 32488, 32750, 38750, 40610, 65500, 77500, 81220, 81875, 101525, 131000, 155000, 162440, 163750, 203050, 327500, 406100, 507625, 655000, 812200, 1015250, 2030500, 2538125, 4061000, 5076250, 10152500, 20305000]

約数ペア:

[(1, 20305000), (2, 10152500), (4, 5076250), (5, 4061000), (8, 2538125), (10, 2030500), (20, 1015250), (25, 812200), (31, 655000), (40, 507625), (50, 406100), (62, 327500), (100, 203050), (124, 163750), (125, 162440), (131, 155000), (155, 131000), (200, 101525), (248, 81875), (250, 81220), (262, 77500), (310, 65500), (500, 40610), (524, 38750), (620, 32750), (625, 32488), (655, 31000), (775, 26200), (1000, 20305), (1048, 19375), (1240, 16375), (1250, 16244), (1310, 15500), (1550, 13100), (2500, 8122), (2620, 7750), (3100, 6550), (3275, 6200), (3875, 5240), (4061, 5000)]