21028120

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{4013}}^1$

素因数の和:4155

約数の個数: 32

約数和(自身を含む): 47686320

約数和(自身を除く): 26658200

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 262, 524, 655, 1048, 1310, 2620, 4013, 5240, 8026, 16052, 20065, 32104, 40130, 80260, 160520, 525703, 1051406, 2102812, 2628515, 4205624, 5257030, 10514060, 21028120]

約数ペア:

[(1, 21028120), (2, 10514060), (4, 5257030), (5, 4205624), (8, 2628515), (10, 2102812), (20, 1051406), (40, 525703), (131, 160520), (262, 80260), (524, 40130), (655, 32104), (1048, 20065), (1310, 16052), (2620, 8026), (4013, 5240)]