19884020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2467}}^1$

素因数の和:2520

約数の個数: 48

約数和(自身を含む): 46437888

約数和(自身を除く): 26553868

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2467, 4030, 4934, 8060, 9868, 12335, 24670, 32071, 49340, 64142, 76477, 128284, 152954, 160355, 305908, 320710, 382385, 641420, 764770, 994201, 1529540, 1988402, 3976804, 4971005, 9942010, 19884020]

約数ペア:

[(1, 19884020), (2, 9942010), (4, 4971005), (5, 3976804), (10, 1988402), (13, 1529540), (20, 994201), (26, 764770), (31, 641420), (52, 382385), (62, 320710), (65, 305908), (124, 160355), (130, 152954), (155, 128284), (260, 76477), (310, 64142), (403, 49340), (620, 32071), (806, 24670), (1612, 12335), (2015, 9868), (2467, 8060), (4030, 4934)]