21011120

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{89}}^1\times {\mathrm{227}}^1$

素因数の和:342

約数の個数: 80

約数和(自身を含む): 53434080

約数和(自身を除く): 32422960

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 89, 104, 130, 178, 208, 227, 260, 356, 445, 454, 520, 712, 890, 908, 1040, 1135, 1157, 1424, 1780, 1816, 2270, 2314, 2951, 3560, 3632, 4540, 4628, 5785, 5902, 7120, 9080, 9256, 11570, 11804, 14755, 18160, 18512, 20203, 23140, 23608, 29510, 40406, 46280, 47216, 59020, 80812, 92560, 101015, 118040, 161624, 202030, 236080, 262639, 323248, 404060, 525278, 808120, 1050556, 1313195, 1616240, 2101112, 2626390, 4202224, 5252780, 10505560, 21011120]

約数ペア:

[(1, 21011120), (2, 10505560), (4, 5252780), (5, 4202224), (8, 2626390), (10, 2101112), (13, 1616240), (16, 1313195), (20, 1050556), (26, 808120), (40, 525278), (52, 404060), (65, 323248), (80, 262639), (89, 236080), (104, 202030), (130, 161624), (178, 118040), (208, 101015), (227, 92560), (260, 80812), (356, 59020), (445, 47216), (454, 46280), (520, 40406), (712, 29510), (890, 23608), (908, 23140), (1040, 20203), (1135, 18512), (1157, 18160), (1424, 14755), (1780, 11804), (1816, 11570), (2270, 9256), (2314, 9080), (2951, 7120), (3560, 5902), (3632, 5785), (4540, 4628)]