21523257

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{17981}}^1$

素因数の和:18013

約数の個数: 24

約数和(自身を含む): 37402560

約数和(自身を除く): 15879303

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 133, 171, 399, 1197, 17981, 53943, 125867, 161829, 341639, 377601, 1024917, 1132803, 2391473, 3074751, 7174419, 21523257]

約数ペア:

[(1, 21523257), (3, 7174419), (7, 3074751), (9, 2391473), (19, 1132803), (21, 1024917), (57, 377601), (63, 341639), (133, 161829), (171, 125867), (399, 53943), (1197, 17981)]