21680316

素因数分解:

$2^2\times 3^2\times 7^1\times {\mathrm{227}}^1\times {\mathrm{379}}^1$

素因数の和:623

約数の個数: 72

約数和(自身を含む): 63073920

約数和(自身を除く): 41393604

約数列:

[1, 2, 3, 4, 6, 7, 9, 12, 14, 18, 21, 28, 36, 42, 63, 84, 126, 227, 252, 379, 454, 681, 758, 908, 1137, 1362, 1516, 1589, 2043, 2274, 2653, 2724, 3178, 3411, 4086, 4548, 4767, 5306, 6356, 6822, 7959, 8172, 9534, 10612, 13644, 14301, 15918, 19068, 23877, 28602, 31836, 47754, 57204, 86033, 95508, 172066, 258099, 344132, 516198, 602231, 774297, 1032396, 1204462, 1548594, 1806693, 2408924, 3097188, 3613386, 5420079, 7226772, 10840158, 21680316]

約数ペア:

[(1, 21680316), (2, 10840158), (3, 7226772), (4, 5420079), (6, 3613386), (7, 3097188), (9, 2408924), (12, 1806693), (14, 1548594), (18, 1204462), (21, 1032396), (28, 774297), (36, 602231), (42, 516198), (63, 344132), (84, 258099), (126, 172066), (227, 95508), (252, 86033), (379, 57204), (454, 47754), (681, 31836), (758, 28602), (908, 23877), (1137, 19068), (1362, 15918), (1516, 14301), (1589, 13644), (2043, 10612), (2274, 9534), (2653, 8172), (2724, 7959), (3178, 6822), (3411, 6356), (4086, 5306), (4548, 4767)]