21691436

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1$

素因数の和:258

約数の個数: 48

約数和(自身を含む): 42688800

約数和(自身を除く): 20997364

約数列:

[1, 2, 4, 13, 26, 43, 52, 86, 89, 109, 172, 178, 218, 356, 436, 559, 1118, 1157, 1417, 2236, 2314, 2834, 3827, 4628, 4687, 5668, 7654, 9374, 9701, 15308, 18748, 19402, 38804, 49751, 60931, 99502, 121862, 126113, 199004, 243724, 252226, 417143, 504452, 834286, 1668572, 5422859, 10845718, 21691436]

約数ペア:

[(1, 21691436), (2, 10845718), (4, 5422859), (13, 1668572), (26, 834286), (43, 504452), (52, 417143), (86, 252226), (89, 243724), (109, 199004), (172, 126113), (178, 121862), (218, 99502), (356, 60931), (436, 49751), (559, 38804), (1118, 19402), (1157, 18748), (1417, 15308), (2236, 9701), (2314, 9374), (2834, 7654), (3827, 5668), (4628, 4687)]