21527660

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{1997}}^1$

素因数の和:2031

約数の個数: 72

約数和(自身を含む): 57398544

約数和(自身を除く): 35870884

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, 1997, 2156, 2695, 3994, 5390, 7988, 9985, 10780, 13979, 19970, 21967, 27958, 39940, 43934, 55916, 69895, 87868, 97853, 109835, 139790, 153769, 195706, 219670, 279580, 307538, 391412, 439340, 489265, 615076, 768845, 978530, 1076383, 1537690, 1957060, 2152766, 3075380, 4305532, 5381915, 10763830, 21527660]

約数ペア:

[(1, 21527660), (2, 10763830), (4, 5381915), (5, 4305532), (7, 3075380), (10, 2152766), (11, 1957060), (14, 1537690), (20, 1076383), (22, 978530), (28, 768845), (35, 615076), (44, 489265), (49, 439340), (55, 391412), (70, 307538), (77, 279580), (98, 219670), (110, 195706), (140, 153769), (154, 139790), (196, 109835), (220, 97853), (245, 87868), (308, 69895), (385, 55916), (490, 43934), (539, 39940), (770, 27958), (980, 21967), (1078, 19970), (1540, 13979), (1997, 10780), (2156, 9985), (2695, 7988), (3994, 5390)]