20771720

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8513}}^1$

素因数の和:8585

約数の個数: 32

約数和(自身を含む): 47508120

約数和(自身を除く): 26736400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8513, 17026, 34052, 42565, 68104, 85130, 170260, 340520, 519293, 1038586, 2077172, 2596465, 4154344, 5192930, 10385860, 20771720]

約数ペア:

[(1, 20771720), (2, 10385860), (4, 5192930), (5, 4154344), (8, 2596465), (10, 2077172), (20, 1038586), (40, 519293), (61, 340520), (122, 170260), (244, 85130), (305, 68104), (488, 42565), (610, 34052), (1220, 17026), (2440, 8513)]