21159680

素因数分解:

$2^8\times 5^1\times {\mathrm{61}}^1\times {\mathrm{271}}^1$

素因数の和:353

約数の個数: 72

約数和(自身を含む): 51705024

約数和(自身を除く): 30545344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 64, 80, 122, 128, 160, 244, 256, 271, 305, 320, 488, 542, 610, 640, 976, 1084, 1220, 1280, 1355, 1952, 2168, 2440, 2710, 3904, 4336, 4880, 5420, 7808, 8672, 9760, 10840, 15616, 16531, 17344, 19520, 21680, 33062, 34688, 39040, 43360, 66124, 69376, 78080, 82655, 86720, 132248, 165310, 173440, 264496, 330620, 346880, 528992, 661240, 1057984, 1322480, 2115968, 2644960, 4231936, 5289920, 10579840, 21159680]

約数ペア:

[(1, 21159680), (2, 10579840), (4, 5289920), (5, 4231936), (8, 2644960), (10, 2115968), (16, 1322480), (20, 1057984), (32, 661240), (40, 528992), (61, 346880), (64, 330620), (80, 264496), (122, 173440), (128, 165310), (160, 132248), (244, 86720), (256, 82655), (271, 78080), (305, 69376), (320, 66124), (488, 43360), (542, 39040), (610, 34688), (640, 33062), (976, 21680), (1084, 19520), (1220, 17344), (1280, 16531), (1355, 15616), (1952, 10840), (2168, 9760), (2440, 8672), (2710, 7808), (3904, 5420), (4336, 4880)]