400520

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1$

素因数の和:78

約数の個数: 64

約数和(自身を含む): 1036800

約数和(自身を除く): 636280

約数列:

[1, 2, 4, 5, 8, 10, 17, 19, 20, 31, 34, 38, 40, 62, 68, 76, 85, 95, 124, 136, 152, 155, 170, 190, 248, 310, 323, 340, 380, 527, 589, 620, 646, 680, 760, 1054, 1178, 1240, 1292, 1615, 2108, 2356, 2584, 2635, 2945, 3230, 4216, 4712, 5270, 5890, 6460, 10013, 10540, 11780, 12920, 20026, 21080, 23560, 40052, 50065, 80104, 100130, 200260, 400520]

約数ペア:

[(1, 400520), (2, 200260), (4, 100130), (5, 80104), (8, 50065), (10, 40052), (17, 23560), (19, 21080), (20, 20026), (31, 12920), (34, 11780), (38, 10540), (40, 10013), (62, 6460), (68, 5890), (76, 5270), (85, 4712), (95, 4216), (124, 3230), (136, 2945), (152, 2635), (155, 2584), (170, 2356), (190, 2108), (248, 1615), (310, 1292), (323, 1240), (340, 1178), (380, 1054), (527, 760), (589, 680), (620, 646)]