21002500

素因数分解:

$2^2\times 5^4\times {\mathrm{31}}^1\times {\mathrm{271}}^1$

素因数の和:326

約数の個数: 60

約数和(自身を含む): 47584768

約数和(自身を除く): 26582268

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 100, 124, 125, 155, 250, 271, 310, 500, 542, 620, 625, 775, 1084, 1250, 1355, 1550, 2500, 2710, 3100, 3875, 5420, 6775, 7750, 8401, 13550, 15500, 16802, 19375, 27100, 33604, 33875, 38750, 42005, 67750, 77500, 84010, 135500, 168020, 169375, 210025, 338750, 420050, 677500, 840100, 1050125, 2100250, 4200500, 5250625, 10501250, 21002500]

約数ペア:

[(1, 21002500), (2, 10501250), (4, 5250625), (5, 4200500), (10, 2100250), (20, 1050125), (25, 840100), (31, 677500), (50, 420050), (62, 338750), (100, 210025), (124, 169375), (125, 168020), (155, 135500), (250, 84010), (271, 77500), (310, 67750), (500, 42005), (542, 38750), (620, 33875), (625, 33604), (775, 27100), (1084, 19375), (1250, 16802), (1355, 15500), (1550, 13550), (2500, 8401), (2710, 7750), (3100, 6775), (3875, 5420)]