20017940

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{389}}^1$

素因数の和:512

約数の個数: 48

約数和(自身を含む): 44029440

約数和(自身を除く): 24011500

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 83, 124, 155, 166, 310, 332, 389, 415, 620, 778, 830, 1556, 1660, 1945, 2573, 3890, 5146, 7780, 10292, 12059, 12865, 24118, 25730, 32287, 48236, 51460, 60295, 64574, 120590, 129148, 161435, 241180, 322870, 645740, 1000897, 2001794, 4003588, 5004485, 10008970, 20017940]

約数ペア:

[(1, 20017940), (2, 10008970), (4, 5004485), (5, 4003588), (10, 2001794), (20, 1000897), (31, 645740), (62, 322870), (83, 241180), (124, 161435), (155, 129148), (166, 120590), (310, 64574), (332, 60295), (389, 51460), (415, 48236), (620, 32287), (778, 25730), (830, 24118), (1556, 12865), (1660, 12059), (1945, 10292), (2573, 7780), (3890, 5146)]