19997325

素因数分解:

$3^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{47}}^1\times {\mathrm{61}}^1$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 38378496

約数和(自身を除く): 18381171

約数列:

[1, 3, 5, 9, 15, 25, 31, 45, 47, 61, 75, 93, 141, 155, 183, 225, 235, 279, 305, 423, 465, 549, 705, 775, 915, 1175, 1395, 1457, 1525, 1891, 2115, 2325, 2745, 2867, 3525, 4371, 4575, 5673, 6975, 7285, 8601, 9455, 10575, 13113, 13725, 14335, 17019, 21855, 25803, 28365, 36425, 43005, 47275, 65565, 71675, 85095, 88877, 109275, 129015, 141825, 215025, 266631, 327825, 425475, 444385, 645075, 799893, 1333155, 2221925, 3999465, 6665775, 19997325]

約数ペア:

[(1, 19997325), (3, 6665775), (5, 3999465), (9, 2221925), (15, 1333155), (25, 799893), (31, 645075), (45, 444385), (47, 425475), (61, 327825), (75, 266631), (93, 215025), (141, 141825), (155, 129015), (183, 109275), (225, 88877), (235, 85095), (279, 71675), (305, 65565), (423, 47275), (465, 43005), (549, 36425), (705, 28365), (775, 25803), (915, 21855), (1175, 17019), (1395, 14335), (1457, 13725), (1525, 13113), (1891, 10575), (2115, 9455), (2325, 8601), (2745, 7285), (2867, 6975), (3525, 5673), (4371, 4575)]