20558780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{239}}^1$

素因数の和:299

約数の個数: 96

約数和(自身を含む): 52254720

約数和(自身を除く): 31695940

約数列:

[1, 2, 4, 5, 10, 11, 17, 20, 22, 23, 34, 44, 46, 55, 68, 85, 92, 110, 115, 170, 187, 220, 230, 239, 253, 340, 374, 391, 460, 478, 506, 748, 782, 935, 956, 1012, 1195, 1265, 1564, 1870, 1955, 2390, 2530, 2629, 3740, 3910, 4063, 4301, 4780, 5060, 5258, 5497, 7820, 8126, 8602, 10516, 10994, 13145, 16252, 17204, 20315, 21505, 21988, 26290, 27485, 40630, 43010, 44693, 52580, 54970, 60467, 81260, 86020, 89386, 93449, 109940, 120934, 178772, 186898, 223465, 241868, 302335, 373796, 446930, 467245, 604670, 893860, 934490, 1027939, 1209340, 1868980, 2055878, 4111756, 5139695, 10279390, 20558780]

約数ペア:

[(1, 20558780), (2, 10279390), (4, 5139695), (5, 4111756), (10, 2055878), (11, 1868980), (17, 1209340), (20, 1027939), (22, 934490), (23, 893860), (34, 604670), (44, 467245), (46, 446930), (55, 373796), (68, 302335), (85, 241868), (92, 223465), (110, 186898), (115, 178772), (170, 120934), (187, 109940), (220, 93449), (230, 89386), (239, 86020), (253, 81260), (340, 60467), (374, 54970), (391, 52580), (460, 44693), (478, 43010), (506, 40630), (748, 27485), (782, 26290), (935, 21988), (956, 21505), (1012, 20315), (1195, 17204), (1265, 16252), (1564, 13145), (1870, 10994), (1955, 10516), (2390, 8602), (2530, 8126), (2629, 7820), (3740, 5497), (3910, 5258), (4063, 5060), (4301, 4780)]