21289880

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{109}}^1\times {\mathrm{257}}^1$

素因数の和:396

約数の個数: 64

約数和(自身を含む): 51084000

約数和(自身を除く): 29794120

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 76, 95, 109, 152, 190, 218, 257, 380, 436, 514, 545, 760, 872, 1028, 1090, 1285, 2056, 2071, 2180, 2570, 4142, 4360, 4883, 5140, 8284, 9766, 10280, 10355, 16568, 19532, 20710, 24415, 28013, 39064, 41420, 48830, 56026, 82840, 97660, 112052, 140065, 195320, 224104, 280130, 532247, 560260, 1064494, 1120520, 2128988, 2661235, 4257976, 5322470, 10644940, 21289880]

約数ペア:

[(1, 21289880), (2, 10644940), (4, 5322470), (5, 4257976), (8, 2661235), (10, 2128988), (19, 1120520), (20, 1064494), (38, 560260), (40, 532247), (76, 280130), (95, 224104), (109, 195320), (152, 140065), (190, 112052), (218, 97660), (257, 82840), (380, 56026), (436, 48830), (514, 41420), (545, 39064), (760, 28013), (872, 24415), (1028, 20710), (1090, 19532), (1285, 16568), (2056, 10355), (2071, 10280), (2180, 9766), (2570, 8284), (4142, 5140), (4360, 4883)]