21305840

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{107}}^1\times {\mathrm{131}}^1$

素因数の和:270

約数の個数: 80

約数和(自身を含む): 53032320

約数和(自身を除く): 31726480

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 107, 131, 152, 190, 214, 262, 304, 380, 428, 524, 535, 655, 760, 856, 1048, 1070, 1310, 1520, 1712, 2033, 2096, 2140, 2489, 2620, 4066, 4280, 4978, 5240, 8132, 8560, 9956, 10165, 10480, 12445, 14017, 16264, 19912, 20330, 24890, 28034, 32528, 39824, 40660, 49780, 56068, 70085, 81320, 99560, 112136, 140170, 162640, 199120, 224272, 266323, 280340, 532646, 560680, 1065292, 1121360, 1331615, 2130584, 2663230, 4261168, 5326460, 10652920, 21305840]

約数ペア:

[(1, 21305840), (2, 10652920), (4, 5326460), (5, 4261168), (8, 2663230), (10, 2130584), (16, 1331615), (19, 1121360), (20, 1065292), (38, 560680), (40, 532646), (76, 280340), (80, 266323), (95, 224272), (107, 199120), (131, 162640), (152, 140170), (190, 112136), (214, 99560), (262, 81320), (304, 70085), (380, 56068), (428, 49780), (524, 40660), (535, 39824), (655, 32528), (760, 28034), (856, 24890), (1048, 20330), (1070, 19912), (1310, 16264), (1520, 14017), (1712, 12445), (2033, 10480), (2096, 10165), (2140, 9956), (2489, 8560), (2620, 8132), (4066, 5240), (4280, 4978)]