19999875

素因数分解:

$3^1\times 5^3\times 7^1\times {\mathrm{19}}^1\times {\mathrm{401}}^1$

素因数の和:445

約数の個数: 64

約数和(自身を含む): 40135680

約数和(自身を除く): 20135805

約数列:

[1, 3, 5, 7, 15, 19, 21, 25, 35, 57, 75, 95, 105, 125, 133, 175, 285, 375, 399, 401, 475, 525, 665, 875, 1203, 1425, 1995, 2005, 2375, 2625, 2807, 3325, 6015, 7125, 7619, 8421, 9975, 10025, 14035, 16625, 22857, 30075, 38095, 42105, 49875, 50125, 53333, 70175, 114285, 150375, 159999, 190475, 210525, 266665, 350875, 571425, 799995, 952375, 1052625, 1333325, 2857125, 3999975, 6666625, 19999875]

約数ペア:

[(1, 19999875), (3, 6666625), (5, 3999975), (7, 2857125), (15, 1333325), (19, 1052625), (21, 952375), (25, 799995), (35, 571425), (57, 350875), (75, 266665), (95, 210525), (105, 190475), (125, 159999), (133, 150375), (175, 114285), (285, 70175), (375, 53333), (399, 50125), (401, 49875), (475, 42105), (525, 38095), (665, 30075), (875, 22857), (1203, 16625), (1425, 14035), (1995, 10025), (2005, 9975), (2375, 8421), (2625, 7619), (2807, 7125), (3325, 6015)]