21815920

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{239}}^1$

素因数の和:422

約数の個数: 80

約数和(自身を含む): 58567680

約数和(自身を除く): 36751760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 163, 239, 280, 326, 478, 560, 652, 815, 956, 1141, 1195, 1304, 1630, 1673, 1912, 2282, 2390, 2608, 3260, 3346, 3824, 4564, 4780, 5705, 6520, 6692, 8365, 9128, 9560, 11410, 13040, 13384, 16730, 18256, 19120, 22820, 26768, 33460, 38957, 45640, 66920, 77914, 91280, 133840, 155828, 194785, 272699, 311656, 389570, 545398, 623312, 779140, 1090796, 1363495, 1558280, 2181592, 2726990, 3116560, 4363184, 5453980, 10907960, 21815920]

約数ペア:

[(1, 21815920), (2, 10907960), (4, 5453980), (5, 4363184), (7, 3116560), (8, 2726990), (10, 2181592), (14, 1558280), (16, 1363495), (20, 1090796), (28, 779140), (35, 623312), (40, 545398), (56, 389570), (70, 311656), (80, 272699), (112, 194785), (140, 155828), (163, 133840), (239, 91280), (280, 77914), (326, 66920), (478, 45640), (560, 38957), (652, 33460), (815, 26768), (956, 22820), (1141, 19120), (1195, 18256), (1304, 16730), (1630, 13384), (1673, 13040), (1912, 11410), (2282, 9560), (2390, 9128), (2608, 8365), (3260, 6692), (3346, 6520), (3824, 5705), (4564, 4780)]