400920

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{257}}^1$

素因数の和:284

約数の個数: 64

約数和(自身を含む): 1300320

約数和(自身を除く): 899400

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 104, 120, 130, 156, 195, 257, 260, 312, 390, 514, 520, 771, 780, 1028, 1285, 1542, 1560, 2056, 2570, 3084, 3341, 3855, 5140, 6168, 6682, 7710, 10023, 10280, 13364, 15420, 16705, 20046, 26728, 30840, 33410, 40092, 50115, 66820, 80184, 100230, 133640, 200460, 400920]

約数ペア:

[(1, 400920), (2, 200460), (3, 133640), (4, 100230), (5, 80184), (6, 66820), (8, 50115), (10, 40092), (12, 33410), (13, 30840), (15, 26728), (20, 20046), (24, 16705), (26, 15420), (30, 13364), (39, 10280), (40, 10023), (52, 7710), (60, 6682), (65, 6168), (78, 5140), (104, 3855), (120, 3341), (130, 3084), (156, 2570), (195, 2056), (257, 1560), (260, 1542), (312, 1285), (390, 1028), (514, 780), (520, 771)]