21065984

素因数分解:

$2^8\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:167

約数の個数: 72

約数和(自身を含む): 45622080

約数和(自身を除く): 24556096

約数列:

[1, 2, 4, 8, 16, 19, 32, 38, 61, 64, 71, 76, 122, 128, 142, 152, 244, 256, 284, 304, 488, 568, 608, 976, 1136, 1159, 1216, 1349, 1952, 2272, 2318, 2432, 2698, 3904, 4331, 4544, 4636, 4864, 5396, 7808, 8662, 9088, 9272, 10792, 15616, 17324, 18176, 18544, 21584, 34648, 37088, 43168, 69296, 74176, 82289, 86336, 138592, 148352, 164578, 172672, 277184, 296704, 329156, 345344, 554368, 658312, 1108736, 1316624, 2633248, 5266496, 10532992, 21065984]

約数ペア:

[(1, 21065984), (2, 10532992), (4, 5266496), (8, 2633248), (16, 1316624), (19, 1108736), (32, 658312), (38, 554368), (61, 345344), (64, 329156), (71, 296704), (76, 277184), (122, 172672), (128, 164578), (142, 148352), (152, 138592), (244, 86336), (256, 82289), (284, 74176), (304, 69296), (488, 43168), (568, 37088), (608, 34648), (976, 21584), (1136, 18544), (1159, 18176), (1216, 17324), (1349, 15616), (1952, 10792), (2272, 9272), (2318, 9088), (2432, 8662), (2698, 7808), (3904, 5396), (4331, 4864), (4544, 4636)]