21445840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{1213}}^1$

素因数の和:1256

約数の個数: 80

約数和(自身を含む): 56902608

約数和(自身を除く): 35456768

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 26, 34, 40, 52, 65, 68, 80, 85, 104, 130, 136, 170, 208, 221, 260, 272, 340, 442, 520, 680, 884, 1040, 1105, 1213, 1360, 1768, 2210, 2426, 3536, 4420, 4852, 6065, 8840, 9704, 12130, 15769, 17680, 19408, 20621, 24260, 31538, 41242, 48520, 63076, 78845, 82484, 97040, 103105, 126152, 157690, 164968, 206210, 252304, 268073, 315380, 329936, 412420, 536146, 630760, 824840, 1072292, 1261520, 1340365, 1649680, 2144584, 2680730, 4289168, 5361460, 10722920, 21445840]

約数ペア:

[(1, 21445840), (2, 10722920), (4, 5361460), (5, 4289168), (8, 2680730), (10, 2144584), (13, 1649680), (16, 1340365), (17, 1261520), (20, 1072292), (26, 824840), (34, 630760), (40, 536146), (52, 412420), (65, 329936), (68, 315380), (80, 268073), (85, 252304), (104, 206210), (130, 164968), (136, 157690), (170, 126152), (208, 103105), (221, 97040), (260, 82484), (272, 78845), (340, 63076), (442, 48520), (520, 41242), (680, 31538), (884, 24260), (1040, 20621), (1105, 19408), (1213, 17680), (1360, 15769), (1768, 12130), (2210, 9704), (2426, 8840), (3536, 6065), (4420, 4852)]