21080620

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{281}}^1$

素因数の和:343

約数の個数: 72

約数和(自身を含む): 50408064

約数和(自身を除く): 29327444

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 31, 44, 55, 62, 110, 121, 124, 155, 220, 242, 281, 310, 341, 484, 562, 605, 620, 682, 1124, 1210, 1364, 1405, 1705, 2420, 2810, 3091, 3410, 3751, 5620, 6182, 6820, 7502, 8711, 12364, 15004, 15455, 17422, 18755, 30910, 34001, 34844, 37510, 43555, 61820, 68002, 75020, 87110, 95821, 136004, 170005, 174220, 191642, 340010, 383284, 479105, 680020, 958210, 1054031, 1916420, 2108062, 4216124, 5270155, 10540310, 21080620]

約数ペア:

[(1, 21080620), (2, 10540310), (4, 5270155), (5, 4216124), (10, 2108062), (11, 1916420), (20, 1054031), (22, 958210), (31, 680020), (44, 479105), (55, 383284), (62, 340010), (110, 191642), (121, 174220), (124, 170005), (155, 136004), (220, 95821), (242, 87110), (281, 75020), (310, 68002), (341, 61820), (484, 43555), (562, 37510), (605, 34844), (620, 34001), (682, 30910), (1124, 18755), (1210, 17422), (1364, 15455), (1405, 15004), (1705, 12364), (2420, 8711), (2810, 7502), (3091, 6820), (3410, 6182), (3751, 5620)]