21020260

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{113}}^1\times {\mathrm{131}}^1$

素因数の和:324

約数の個数: 48

約数和(自身を含む): 45505152

約数和(自身を除く): 24484892

約数列:

[1, 2, 4, 5, 10, 20, 71, 113, 131, 142, 226, 262, 284, 355, 452, 524, 565, 655, 710, 1130, 1310, 1420, 2260, 2620, 8023, 9301, 14803, 16046, 18602, 29606, 32092, 37204, 40115, 46505, 59212, 74015, 80230, 93010, 148030, 160460, 186020, 296060, 1051013, 2102026, 4204052, 5255065, 10510130, 21020260]

約数ペア:

[(1, 21020260), (2, 10510130), (4, 5255065), (5, 4204052), (10, 2102026), (20, 1051013), (71, 296060), (113, 186020), (131, 160460), (142, 148030), (226, 93010), (262, 80230), (284, 74015), (355, 59212), (452, 46505), (524, 40115), (565, 37204), (655, 32092), (710, 29606), (1130, 18602), (1310, 16046), (1420, 14803), (2260, 9301), (2620, 8023)]