20871680

素因数分解:

$2^9\times 5^1\times {\mathrm{31}}^1\times {\mathrm{263}}^1$

素因数の和:317

約数の個数: 80

約数和(自身を含む): 51853824

約数和(自身を除く): 30982144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 263, 310, 320, 496, 512, 526, 620, 640, 992, 1052, 1240, 1280, 1315, 1984, 2104, 2480, 2560, 2630, 3968, 4208, 4960, 5260, 7936, 8153, 8416, 9920, 10520, 15872, 16306, 16832, 19840, 21040, 32612, 33664, 39680, 40765, 42080, 65224, 67328, 79360, 81530, 84160, 130448, 134656, 163060, 168320, 260896, 326120, 336640, 521792, 652240, 673280, 1043584, 1304480, 2087168, 2608960, 4174336, 5217920, 10435840, 20871680]

約数ペア:

[(1, 20871680), (2, 10435840), (4, 5217920), (5, 4174336), (8, 2608960), (10, 2087168), (16, 1304480), (20, 1043584), (31, 673280), (32, 652240), (40, 521792), (62, 336640), (64, 326120), (80, 260896), (124, 168320), (128, 163060), (155, 134656), (160, 130448), (248, 84160), (256, 81530), (263, 79360), (310, 67328), (320, 65224), (496, 42080), (512, 40765), (526, 39680), (620, 33664), (640, 32612), (992, 21040), (1052, 19840), (1240, 16832), (1280, 16306), (1315, 15872), (1984, 10520), (2104, 9920), (2480, 8416), (2560, 8153), (2630, 7936), (3968, 5260), (4208, 4960)]