21102015

素因数分解:

$3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{7523}}^1$

素因数の和:7559

約数の個数: 32

約数和(自身を含む): 39004416

約数和(自身を除く): 17902401

約数列:

[1, 3, 5, 11, 15, 17, 33, 51, 55, 85, 165, 187, 255, 561, 935, 2805, 7523, 22569, 37615, 82753, 112845, 127891, 248259, 383673, 413765, 639455, 1241295, 1406801, 1918365, 4220403, 7034005, 21102015]

約数ペア:

[(1, 21102015), (3, 7034005), (5, 4220403), (11, 1918365), (15, 1406801), (17, 1241295), (33, 639455), (51, 413765), (55, 383673), (85, 248259), (165, 127891), (187, 112845), (255, 82753), (561, 37615), (935, 22569), (2805, 7523)]