21484240

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8663}}^1$

素因数の和:8707

約数の個数: 40

約数和(自身を含む): 51568128

約数和(自身を除く): 30083888

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8663, 17326, 34652, 43315, 69304, 86630, 138608, 173260, 268553, 346520, 537106, 693040, 1074212, 1342765, 2148424, 2685530, 4296848, 5371060, 10742120, 21484240]

約数ペア:

[(1, 21484240), (2, 10742120), (4, 5371060), (5, 4296848), (8, 2685530), (10, 2148424), (16, 1342765), (20, 1074212), (31, 693040), (40, 537106), (62, 346520), (80, 268553), (124, 173260), (155, 138608), (248, 86630), (310, 69304), (496, 43315), (620, 34652), (1240, 17326), (2480, 8663)]