18881320

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{397}}^1$

素因数の和:478

約数の個数: 64

約数和(自身を含む): 45133200

約数和(自身を除く): 26251880

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 41, 58, 82, 116, 145, 164, 205, 232, 290, 328, 397, 410, 580, 794, 820, 1160, 1189, 1588, 1640, 1985, 2378, 3176, 3970, 4756, 5945, 7940, 9512, 11513, 11890, 15880, 16277, 23026, 23780, 32554, 46052, 47560, 57565, 65108, 81385, 92104, 115130, 130216, 162770, 230260, 325540, 460520, 472033, 651080, 944066, 1888132, 2360165, 3776264, 4720330, 9440660, 18881320]

約数ペア:

[(1, 18881320), (2, 9440660), (4, 4720330), (5, 3776264), (8, 2360165), (10, 1888132), (20, 944066), (29, 651080), (40, 472033), (41, 460520), (58, 325540), (82, 230260), (116, 162770), (145, 130216), (164, 115130), (205, 92104), (232, 81385), (290, 65108), (328, 57565), (397, 47560), (410, 46052), (580, 32554), (794, 23780), (820, 23026), (1160, 16277), (1189, 15880), (1588, 11890), (1640, 11513), (1985, 9512), (2378, 7940), (3176, 5945), (3970, 4756)]