21878870

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{89}}^1$

素因数の和:201

約数の個数: 64

約数和(自身を含む): 44997120

約数和(自身を除く): 23118250

約数列:

[1, 2, 5, 10, 13, 26, 31, 61, 62, 65, 89, 122, 130, 155, 178, 305, 310, 403, 445, 610, 793, 806, 890, 1157, 1586, 1891, 2015, 2314, 2759, 3782, 3965, 4030, 5429, 5518, 5785, 7930, 9455, 10858, 11570, 13795, 18910, 24583, 27145, 27590, 35867, 49166, 54290, 70577, 71734, 122915, 141154, 168299, 179335, 245830, 336598, 352885, 358670, 705770, 841495, 1682990, 2187887, 4375774, 10939435, 21878870]

約数ペア:

[(1, 21878870), (2, 10939435), (5, 4375774), (10, 2187887), (13, 1682990), (26, 841495), (31, 705770), (61, 358670), (62, 352885), (65, 336598), (89, 245830), (122, 179335), (130, 168299), (155, 141154), (178, 122915), (305, 71734), (310, 70577), (403, 54290), (445, 49166), (610, 35867), (793, 27590), (806, 27145), (890, 24583), (1157, 18910), (1586, 13795), (1891, 11570), (2015, 10858), (2314, 9455), (2759, 7930), (3782, 5785), (3965, 5518), (4030, 5429)]