20851020

素因数分解:

$2^2\times 3^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{211}}^1$

素因数の和:293

約数の個数: 120

約数和(自身を含む): 66797808

約数和(自身を除く): 45946788

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 61, 81, 90, 108, 122, 135, 162, 180, 183, 211, 244, 270, 305, 324, 366, 405, 422, 540, 549, 610, 633, 732, 810, 844, 915, 1055, 1098, 1220, 1266, 1620, 1647, 1830, 1899, 2110, 2196, 2532, 2745, 3165, 3294, 3660, 3798, 4220, 4941, 5490, 5697, 6330, 6588, 7596, 8235, 9495, 9882, 10980, 11394, 12660, 12871, 16470, 17091, 18990, 19764, 22788, 24705, 25742, 28485, 32940, 34182, 37980, 38613, 49410, 51484, 56970, 64355, 68364, 77226, 85455, 98820, 113940, 115839, 128710, 154452, 170910, 193065, 231678, 257420, 341820, 347517, 386130, 463356, 579195, 695034, 772260, 1042551, 1158390, 1390068, 1737585, 2085102, 2316780, 3475170, 4170204, 5212755, 6950340, 10425510, 20851020]

約数ペア:

[(1, 20851020), (2, 10425510), (3, 6950340), (4, 5212755), (5, 4170204), (6, 3475170), (9, 2316780), (10, 2085102), (12, 1737585), (15, 1390068), (18, 1158390), (20, 1042551), (27, 772260), (30, 695034), (36, 579195), (45, 463356), (54, 386130), (60, 347517), (61, 341820), (81, 257420), (90, 231678), (108, 193065), (122, 170910), (135, 154452), (162, 128710), (180, 115839), (183, 113940), (211, 98820), (244, 85455), (270, 77226), (305, 68364), (324, 64355), (366, 56970), (405, 51484), (422, 49410), (540, 38613), (549, 37980), (610, 34182), (633, 32940), (732, 28485), (810, 25742), (844, 24705), (915, 22788), (1055, 19764), (1098, 18990), (1220, 17091), (1266, 16470), (1620, 12871), (1647, 12660), (1830, 11394), (1899, 10980), (2110, 9882), (2196, 9495), (2532, 8235), (2745, 7596), (3165, 6588), (3294, 6330), (3660, 5697), (3798, 5490), (4220, 4941)]