21484540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{1993}}^1$

素因数の和:2027

約数の個数: 72

約数和(自身を含む): 57283632

約数和(自身を除く): 35799092

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 1993, 2156, 2695, 3986, 5390, 7972, 9965, 10780, 13951, 19930, 21923, 27902, 39860, 43846, 55804, 69755, 87692, 97657, 109615, 139510, 153461, 195314, 219230, 279020, 306922, 390628, 438460, 488285, 613844, 767305, 976570, 1074227, 1534610, 1953140, 2148454, 3069220, 4296908, 5371135, 10742270, 21484540]

約数ペア:

[(1, 21484540), (2, 10742270), (4, 5371135), (5, 4296908), (7, 3069220), (10, 2148454), (11, 1953140), (14, 1534610), (20, 1074227), (22, 976570), (28, 767305), (35, 613844), (44, 488285), (49, 438460), (55, 390628), (70, 306922), (77, 279020), (98, 219230), (110, 195314), (140, 153461), (154, 139510), (196, 109615), (220, 97657), (245, 87692), (308, 69755), (385, 55804), (490, 43846), (539, 39860), (770, 27902), (980, 21923), (1078, 19930), (1540, 13951), (1993, 10780), (2156, 9965), (2695, 7972), (3986, 5390)]