20131000

素因数分解:

$2^3\times 5^3\times {\mathrm{41}}^1\times {\mathrm{491}}^1$

素因数の和:553

約数の個数: 64

約数和(自身を含む): 48353760

約数和(自身を除く): 28222760

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 41, 50, 82, 100, 125, 164, 200, 205, 250, 328, 410, 491, 500, 820, 982, 1000, 1025, 1640, 1964, 2050, 2455, 3928, 4100, 4910, 5125, 8200, 9820, 10250, 12275, 19640, 20131, 20500, 24550, 40262, 41000, 49100, 61375, 80524, 98200, 100655, 122750, 161048, 201310, 245500, 402620, 491000, 503275, 805240, 1006550, 2013100, 2516375, 4026200, 5032750, 10065500, 20131000]

約数ペア:

[(1, 20131000), (2, 10065500), (4, 5032750), (5, 4026200), (8, 2516375), (10, 2013100), (20, 1006550), (25, 805240), (40, 503275), (41, 491000), (50, 402620), (82, 245500), (100, 201310), (125, 161048), (164, 122750), (200, 100655), (205, 98200), (250, 80524), (328, 61375), (410, 49100), (491, 41000), (500, 40262), (820, 24550), (982, 20500), (1000, 20131), (1025, 19640), (1640, 12275), (1964, 10250), (2050, 9820), (2455, 8200), (3928, 5125), (4100, 4910)]