19660840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{997}}^1$

素因数の和:1054

約数の個数: 64

約数和(自身を含む): 48502800

約数和(自身を除く): 28841960

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 29, 34, 40, 58, 68, 85, 116, 136, 145, 170, 232, 290, 340, 493, 580, 680, 986, 997, 1160, 1972, 1994, 2465, 3944, 3988, 4930, 4985, 7976, 9860, 9970, 16949, 19720, 19940, 28913, 33898, 39880, 57826, 67796, 84745, 115652, 135592, 144565, 169490, 231304, 289130, 338980, 491521, 578260, 677960, 983042, 1156520, 1966084, 2457605, 3932168, 4915210, 9830420, 19660840]

約数ペア:

[(1, 19660840), (2, 9830420), (4, 4915210), (5, 3932168), (8, 2457605), (10, 1966084), (17, 1156520), (20, 983042), (29, 677960), (34, 578260), (40, 491521), (58, 338980), (68, 289130), (85, 231304), (116, 169490), (136, 144565), (145, 135592), (170, 115652), (232, 84745), (290, 67796), (340, 57826), (493, 39880), (580, 33898), (680, 28913), (986, 19940), (997, 19720), (1160, 16949), (1972, 9970), (1994, 9860), (2465, 7976), (3944, 4985), (3988, 4930)]