20961855

素因数分解:

$3^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{157}}^1$

素因数の和:237

約数の個数: 64

約数和(自身を含む): 40043520

約数和(自身を除く): 19081665

約数列:

[1, 3, 5, 9, 15, 23, 27, 43, 45, 69, 115, 129, 135, 157, 207, 215, 345, 387, 471, 621, 645, 785, 989, 1035, 1161, 1413, 1935, 2355, 2967, 3105, 3611, 4239, 4945, 5805, 6751, 7065, 8901, 10833, 14835, 18055, 20253, 21195, 26703, 32499, 33755, 44505, 54165, 60759, 97497, 101265, 133515, 155273, 162495, 182277, 303795, 465819, 487485, 776365, 911385, 1397457, 2329095, 4192371, 6987285, 20961855]

約数ペア:

[(1, 20961855), (3, 6987285), (5, 4192371), (9, 2329095), (15, 1397457), (23, 911385), (27, 776365), (43, 487485), (45, 465819), (69, 303795), (115, 182277), (129, 162495), (135, 155273), (157, 133515), (207, 101265), (215, 97497), (345, 60759), (387, 54165), (471, 44505), (621, 33755), (645, 32499), (785, 26703), (989, 21195), (1035, 20253), (1161, 18055), (1413, 14835), (1935, 10833), (2355, 8901), (2967, 7065), (3105, 6751), (3611, 5805), (4239, 4945)]