19490720

素因数分解:

$2^5\times 5^1\times {\mathrm{61}}^1\times {\mathrm{1997}}^1$

素因数の和:2073

約数の個数: 48

約数和(自身を含む): 46825128

約数和(自身を除く): 27334408

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 61, 80, 122, 160, 244, 305, 488, 610, 976, 1220, 1952, 1997, 2440, 3994, 4880, 7988, 9760, 9985, 15976, 19970, 31952, 39940, 63904, 79880, 121817, 159760, 243634, 319520, 487268, 609085, 974536, 1218170, 1949072, 2436340, 3898144, 4872680, 9745360, 19490720]

約数ペア:

[(1, 19490720), (2, 9745360), (4, 4872680), (5, 3898144), (8, 2436340), (10, 1949072), (16, 1218170), (20, 974536), (32, 609085), (40, 487268), (61, 319520), (80, 243634), (122, 159760), (160, 121817), (244, 79880), (305, 63904), (488, 39940), (610, 31952), (976, 19970), (1220, 15976), (1952, 9985), (1997, 9760), (2440, 7988), (3994, 4880)]