21989890

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{61}}^1$

素因数の和:187

約数の個数: 64

約数和(自身を含む): 44997120

約数和(自身を除く): 23007230

約数列:

[1, 2, 5, 10, 13, 26, 47, 59, 61, 65, 94, 118, 122, 130, 235, 295, 305, 470, 590, 610, 611, 767, 793, 1222, 1534, 1586, 2773, 2867, 3055, 3599, 3835, 3965, 5546, 5734, 6110, 7198, 7670, 7930, 13865, 14335, 17995, 27730, 28670, 35990, 36049, 37271, 46787, 72098, 74542, 93574, 169153, 180245, 186355, 233935, 338306, 360490, 372710, 467870, 845765, 1691530, 2198989, 4397978, 10994945, 21989890]

約数ペア:

[(1, 21989890), (2, 10994945), (5, 4397978), (10, 2198989), (13, 1691530), (26, 845765), (47, 467870), (59, 372710), (61, 360490), (65, 338306), (94, 233935), (118, 186355), (122, 180245), (130, 169153), (235, 93574), (295, 74542), (305, 72098), (470, 46787), (590, 37271), (610, 36049), (611, 35990), (767, 28670), (793, 27730), (1222, 17995), (1534, 14335), (1586, 13865), (2773, 7930), (2867, 7670), (3055, 7198), (3599, 6110), (3835, 5734), (3965, 5546)]