21394840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{73}}^1\times {\mathrm{431}}^1$

素因数の和:532

約数の個数: 64

約数和(自身を含む): 51788160

約数和(自身を除く): 30393320

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 73, 85, 136, 146, 170, 292, 340, 365, 431, 584, 680, 730, 862, 1241, 1460, 1724, 2155, 2482, 2920, 3448, 4310, 4964, 6205, 7327, 8620, 9928, 12410, 14654, 17240, 24820, 29308, 31463, 36635, 49640, 58616, 62926, 73270, 125852, 146540, 157315, 251704, 293080, 314630, 534871, 629260, 1069742, 1258520, 2139484, 2674355, 4278968, 5348710, 10697420, 21394840]

約数ペア:

[(1, 21394840), (2, 10697420), (4, 5348710), (5, 4278968), (8, 2674355), (10, 2139484), (17, 1258520), (20, 1069742), (34, 629260), (40, 534871), (68, 314630), (73, 293080), (85, 251704), (136, 157315), (146, 146540), (170, 125852), (292, 73270), (340, 62926), (365, 58616), (431, 49640), (584, 36635), (680, 31463), (730, 29308), (862, 24820), (1241, 17240), (1460, 14654), (1724, 12410), (2155, 9928), (2482, 8620), (2920, 7327), (3448, 6205), (4310, 4964)]