28705880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{157}}^1\times {\mathrm{653}}^1$

素因数の和:828

約数の個数: 64

約数和(自身を含む): 74399040

約数和(自身を除く): 45693160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 157, 280, 314, 628, 653, 785, 1099, 1256, 1306, 1570, 2198, 2612, 3140, 3265, 4396, 4571, 5224, 5495, 6280, 6530, 8792, 9142, 10990, 13060, 18284, 21980, 22855, 26120, 36568, 43960, 45710, 91420, 102521, 182840, 205042, 410084, 512605, 717647, 820168, 1025210, 1435294, 2050420, 2870588, 3588235, 4100840, 5741176, 7176470, 14352940, 28705880]

約数ペア:

[(1, 28705880), (2, 14352940), (4, 7176470), (5, 5741176), (7, 4100840), (8, 3588235), (10, 2870588), (14, 2050420), (20, 1435294), (28, 1025210), (35, 820168), (40, 717647), (56, 512605), (70, 410084), (140, 205042), (157, 182840), (280, 102521), (314, 91420), (628, 45710), (653, 43960), (785, 36568), (1099, 26120), (1256, 22855), (1306, 21980), (1570, 18284), (2198, 13060), (2612, 10990), (3140, 9142), (3265, 8792), (4396, 6530), (4571, 6280), (5224, 5495)]