21208960

素因数分解:

$2^7\times 5^1\times {\mathrm{31}}^1\times {\mathrm{1069}}^1$

素因数の和:1119

約数の個数: 64

約数和(自身を含む): 52387200

約数和(自身を除く): 31178240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1069, 1240, 1984, 2138, 2480, 3968, 4276, 4960, 5345, 8552, 9920, 10690, 17104, 19840, 21380, 33139, 34208, 42760, 66278, 68416, 85520, 132556, 136832, 165695, 171040, 265112, 331390, 342080, 530224, 662780, 684160, 1060448, 1325560, 2120896, 2651120, 4241792, 5302240, 10604480, 21208960]

約数ペア:

[(1, 21208960), (2, 10604480), (4, 5302240), (5, 4241792), (8, 2651120), (10, 2120896), (16, 1325560), (20, 1060448), (31, 684160), (32, 662780), (40, 530224), (62, 342080), (64, 331390), (80, 265112), (124, 171040), (128, 165695), (155, 136832), (160, 132556), (248, 85520), (310, 68416), (320, 66278), (496, 42760), (620, 34208), (640, 33139), (992, 21380), (1069, 19840), (1240, 17104), (1984, 10690), (2138, 9920), (2480, 8552), (3968, 5345), (4276, 4960)]