21289790

素因数分解:

$2^1\times 5^1\times {\mathrm{101}}^1\times {\mathrm{107}}^1\times {\mathrm{197}}^1$

素因数の和:412

約数の個数: 32

約数和(自身を含む): 39261024

約数和(自身を除く): 17971234

約数列:

[1, 2, 5, 10, 101, 107, 197, 202, 214, 394, 505, 535, 985, 1010, 1070, 1970, 10807, 19897, 21079, 21614, 39794, 42158, 54035, 99485, 105395, 108070, 198970, 210790, 2128979, 4257958, 10644895, 21289790]

約数ペア:

[(1, 21289790), (2, 10644895), (5, 4257958), (10, 2128979), (101, 210790), (107, 198970), (197, 108070), (202, 105395), (214, 99485), (394, 54035), (505, 42158), (535, 39794), (985, 21614), (1010, 21079), (1070, 19897), (1970, 10807)]