21105513

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^2\times {\mathrm{31}}^1$

素因数の和:107

約数の個数: 72

約数和(自身を含む): 38648064

約数和(自身を除く): 17542551

約数列:

[1, 3, 9, 11, 13, 23, 31, 33, 39, 69, 93, 99, 117, 143, 207, 253, 279, 299, 341, 403, 429, 529, 713, 759, 897, 1023, 1209, 1287, 1587, 2139, 2277, 2691, 3069, 3289, 3627, 4433, 4761, 5819, 6417, 6877, 7843, 9269, 9867, 13299, 16399, 17457, 20631, 23529, 27807, 29601, 39897, 49197, 52371, 61893, 70587, 75647, 83421, 101959, 147591, 180389, 213187, 226941, 305877, 541167, 639561, 680823, 917631, 1623501, 1918683, 2345057, 7035171, 21105513]

約数ペア:

[(1, 21105513), (3, 7035171), (9, 2345057), (11, 1918683), (13, 1623501), (23, 917631), (31, 680823), (33, 639561), (39, 541167), (69, 305877), (93, 226941), (99, 213187), (117, 180389), (143, 147591), (207, 101959), (253, 83421), (279, 75647), (299, 70587), (341, 61893), (403, 52371), (429, 49197), (529, 39897), (713, 29601), (759, 27807), (897, 23529), (1023, 20631), (1209, 17457), (1287, 16399), (1587, 13299), (2139, 9867), (2277, 9269), (2691, 7843), (3069, 6877), (3289, 6417), (3627, 5819), (4433, 4761)]