21727251

素因数分解:

$3^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{239}}^1$

素因数の和:305

約数の個数: 64

約数和(自身を含む): 40857600

約数和(自身を除く): 19130349

約数列:

[1, 3, 7, 9, 13, 21, 27, 37, 39, 63, 91, 111, 117, 189, 239, 259, 273, 333, 351, 481, 717, 777, 819, 999, 1443, 1673, 2151, 2331, 2457, 3107, 3367, 4329, 5019, 6453, 6993, 8843, 9321, 10101, 12987, 15057, 21749, 26529, 27963, 30303, 45171, 61901, 65247, 79587, 83889, 90909, 114959, 185703, 195741, 238761, 344877, 557109, 587223, 804713, 1034631, 1671327, 2414139, 3103893, 7242417, 21727251]

約数ペア:

[(1, 21727251), (3, 7242417), (7, 3103893), (9, 2414139), (13, 1671327), (21, 1034631), (27, 804713), (37, 587223), (39, 557109), (63, 344877), (91, 238761), (111, 195741), (117, 185703), (189, 114959), (239, 90909), (259, 83889), (273, 79587), (333, 65247), (351, 61901), (481, 45171), (717, 30303), (777, 27963), (819, 26529), (999, 21749), (1443, 15057), (1673, 12987), (2151, 10101), (2331, 9321), (2457, 8843), (3107, 6993), (3367, 6453), (4329, 5019)]