18989980

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{281}}^1$

素因数の和:430

約数の個数: 48

約数和(自身を含む): 41690880

約数和(自身を除く): 22700900

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 109, 124, 155, 218, 281, 310, 436, 545, 562, 620, 1090, 1124, 1405, 2180, 2810, 3379, 5620, 6758, 8711, 13516, 16895, 17422, 30629, 33790, 34844, 43555, 61258, 67580, 87110, 122516, 153145, 174220, 306290, 612580, 949499, 1898998, 3797996, 4747495, 9494990, 18989980]

約数ペア:

[(1, 18989980), (2, 9494990), (4, 4747495), (5, 3797996), (10, 1898998), (20, 949499), (31, 612580), (62, 306290), (109, 174220), (124, 153145), (155, 122516), (218, 87110), (281, 67580), (310, 61258), (436, 43555), (545, 34844), (562, 33790), (620, 30629), (1090, 17422), (1124, 16895), (1405, 13516), (2180, 8711), (2810, 6758), (3379, 5620)]