21247960

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{31247}}^1$

素因数の和:31275

約数の個数: 32

約数和(自身を含む): 50621760

約数和(自身を除く): 29373800

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340, 680, 31247, 62494, 124988, 156235, 249976, 312470, 531199, 624940, 1062398, 1249880, 2124796, 2655995, 4249592, 5311990, 10623980, 21247960]

約数ペア:

[(1, 21247960), (2, 10623980), (4, 5311990), (5, 4249592), (8, 2655995), (10, 2124796), (17, 1249880), (20, 1062398), (34, 624940), (40, 531199), (68, 312470), (85, 249976), (136, 156235), (170, 124988), (340, 62494), (680, 31247)]