21328528

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{41}}^2\times {\mathrm{61}}^1$

素因数の和:164

約数の個数: 60

約数和(自身を含む): 46362484

約数和(自身を除く): 25033956

約数列:

[1, 2, 4, 8, 13, 16, 26, 41, 52, 61, 82, 104, 122, 164, 208, 244, 328, 488, 533, 656, 793, 976, 1066, 1586, 1681, 2132, 2501, 3172, 3362, 4264, 5002, 6344, 6724, 8528, 10004, 12688, 13448, 20008, 21853, 26896, 32513, 40016, 43706, 65026, 87412, 102541, 130052, 174824, 205082, 260104, 349648, 410164, 520208, 820328, 1333033, 1640656, 2666066, 5332132, 10664264, 21328528]

約数ペア:

[(1, 21328528), (2, 10664264), (4, 5332132), (8, 2666066), (13, 1640656), (16, 1333033), (26, 820328), (41, 520208), (52, 410164), (61, 349648), (82, 260104), (104, 205082), (122, 174824), (164, 130052), (208, 102541), (244, 87412), (328, 65026), (488, 43706), (533, 40016), (656, 32513), (793, 26896), (976, 21853), (1066, 20008), (1586, 13448), (1681, 12688), (2132, 10004), (2501, 8528), (3172, 6724), (3362, 6344), (4264, 5002)]