21380458820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{397}}^1\times {\mathrm{12409}}^1$

素因数の和:12853

約数の個数: 96

約数和(自身を含む): 53106063360

約数和(自身を除く): 31725604540

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 397, 434, 620, 794, 868, 1085, 1588, 1985, 2170, 2779, 3970, 4340, 5558, 7940, 11116, 12307, 12409, 13895, 24614, 24818, 27790, 49228, 49636, 55580, 61535, 62045, 86149, 86863, 123070, 124090, 172298, 173726, 246140, 248180, 344596, 347452, 384679, 430745, 434315, 769358, 861490, 868630, 1538716, 1722980, 1737260, 1923395, 2692753, 3846790, 4926373, 5385506, 7693580, 9852746, 10771012, 13463765, 19705492, 24631865, 26927530, 34484611, 49263730, 53855060, 68969222, 98527460, 137938444, 152717563, 172423055, 305435126, 344846110, 610870252, 689692220, 763587815, 1069022941, 1527175630, 2138045882, 3054351260, 4276091764, 5345114705, 10690229410, 21380458820]

約数ペア:

[(1, 21380458820), (2, 10690229410), (4, 5345114705), (5, 4276091764), (7, 3054351260), (10, 2138045882), (14, 1527175630), (20, 1069022941), (28, 763587815), (31, 689692220), (35, 610870252), (62, 344846110), (70, 305435126), (124, 172423055), (140, 152717563), (155, 137938444), (217, 98527460), (310, 68969222), (397, 53855060), (434, 49263730), (620, 34484611), (794, 26927530), (868, 24631865), (1085, 19705492), (1588, 13463765), (1985, 10771012), (2170, 9852746), (2779, 7693580), (3970, 5385506), (4340, 4926373), (5558, 3846790), (7940, 2692753), (11116, 1923395), (12307, 1737260), (12409, 1722980), (13895, 1538716), (24614, 868630), (24818, 861490), (27790, 769358), (49228, 434315), (49636, 430745), (55580, 384679), (61535, 347452), (62045, 344596), (86149, 248180), (86863, 246140), (123070, 173726), (124090, 172298)]