18978820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4373}}^1$

素因数の和:4420

約数の個数: 48

約数和(自身を含む): 47029248

約数和(自身を除く): 28050428

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 62, 70, 124, 140, 155, 217, 310, 434, 620, 868, 1085, 2170, 4340, 4373, 8746, 17492, 21865, 30611, 43730, 61222, 87460, 122444, 135563, 153055, 271126, 306110, 542252, 612220, 677815, 948941, 1355630, 1897882, 2711260, 3795764, 4744705, 9489410, 18978820]

約数ペア:

[(1, 18978820), (2, 9489410), (4, 4744705), (5, 3795764), (7, 2711260), (10, 1897882), (14, 1355630), (20, 948941), (28, 677815), (31, 612220), (35, 542252), (62, 306110), (70, 271126), (124, 153055), (140, 135563), (155, 122444), (217, 87460), (310, 61222), (434, 43730), (620, 30611), (868, 21865), (1085, 17492), (2170, 8746), (4340, 4373)]