21157760

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{2543}}^1$

素因数の和:2575

約数の個数: 64

約数和(自身を含む): 54492480

約数和(自身を除く): 33334720

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 2543, 4160, 5086, 8320, 10172, 12715, 20344, 25430, 33059, 40688, 50860, 66118, 81376, 101720, 132236, 162752, 165295, 203440, 264472, 325504, 330590, 406880, 528944, 661180, 813760, 1057888, 1322360, 1627520, 2115776, 2644720, 4231552, 5289440, 10578880, 21157760]

約数ペア:

[(1, 21157760), (2, 10578880), (4, 5289440), (5, 4231552), (8, 2644720), (10, 2115776), (13, 1627520), (16, 1322360), (20, 1057888), (26, 813760), (32, 661180), (40, 528944), (52, 406880), (64, 330590), (65, 325504), (80, 264472), (104, 203440), (128, 165295), (130, 162752), (160, 132236), (208, 101720), (260, 81376), (320, 66118), (416, 50860), (520, 40688), (640, 33059), (832, 25430), (1040, 20344), (1664, 12715), (2080, 10172), (2543, 8320), (4160, 5086)]