21492020

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{83}}^1\times {\mathrm{107}}^1$

素因数の和:221

約数の個数: 72

約数和(自身を含む): 50676192

約数和(自身を除く): 29184172

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 83, 107, 110, 121, 166, 214, 220, 242, 332, 415, 428, 484, 535, 605, 830, 913, 1070, 1177, 1210, 1660, 1826, 2140, 2354, 2420, 3652, 4565, 4708, 5885, 8881, 9130, 10043, 11770, 12947, 17762, 18260, 20086, 23540, 25894, 35524, 40172, 44405, 50215, 51788, 64735, 88810, 97691, 100430, 129470, 177620, 195382, 200860, 258940, 390764, 488455, 976910, 1074601, 1953820, 2149202, 4298404, 5373005, 10746010, 21492020]

約数ペア:

[(1, 21492020), (2, 10746010), (4, 5373005), (5, 4298404), (10, 2149202), (11, 1953820), (20, 1074601), (22, 976910), (44, 488455), (55, 390764), (83, 258940), (107, 200860), (110, 195382), (121, 177620), (166, 129470), (214, 100430), (220, 97691), (242, 88810), (332, 64735), (415, 51788), (428, 50215), (484, 44405), (535, 40172), (605, 35524), (830, 25894), (913, 23540), (1070, 20086), (1177, 18260), (1210, 17762), (1660, 12947), (1826, 11770), (2140, 10043), (2354, 9130), (2420, 8881), (3652, 5885), (4565, 4708)]