21506560

素因数分解:

$2^9\times 5^1\times {\mathrm{31}}^1\times {\mathrm{271}}^1$

素因数の和:325

約数の個数: 80

約数和(自身を含む): 53425152

約数和(自身を除く): 31918592

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 271, 310, 320, 496, 512, 542, 620, 640, 992, 1084, 1240, 1280, 1355, 1984, 2168, 2480, 2560, 2710, 3968, 4336, 4960, 5420, 7936, 8401, 8672, 9920, 10840, 15872, 16802, 17344, 19840, 21680, 33604, 34688, 39680, 42005, 43360, 67208, 69376, 79360, 84010, 86720, 134416, 138752, 168020, 173440, 268832, 336040, 346880, 537664, 672080, 693760, 1075328, 1344160, 2150656, 2688320, 4301312, 5376640, 10753280, 21506560]

約数ペア:

[(1, 21506560), (2, 10753280), (4, 5376640), (5, 4301312), (8, 2688320), (10, 2150656), (16, 1344160), (20, 1075328), (31, 693760), (32, 672080), (40, 537664), (62, 346880), (64, 336040), (80, 268832), (124, 173440), (128, 168020), (155, 138752), (160, 134416), (248, 86720), (256, 84010), (271, 79360), (310, 69376), (320, 67208), (496, 43360), (512, 42005), (542, 39680), (620, 34688), (640, 33604), (992, 21680), (1084, 19840), (1240, 17344), (1280, 16802), (1355, 15872), (1984, 10840), (2168, 9920), (2480, 8672), (2560, 8401), (2710, 7936), (3968, 5420), (4336, 4960)]