21790821

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{1429}}^1$

素因数の和:1485

約数の個数: 32

約数和(自身を含む): 34594560

約数和(自身を除く): 12803739

約数列:

[1, 3, 13, 17, 23, 39, 51, 69, 221, 299, 391, 663, 897, 1173, 1429, 4287, 5083, 15249, 18577, 24293, 32867, 55731, 72879, 98601, 315809, 427271, 558739, 947427, 1281813, 1676217, 7263607, 21790821]

約数ペア:

[(1, 21790821), (3, 7263607), (13, 1676217), (17, 1281813), (23, 947427), (39, 558739), (51, 427271), (69, 315809), (221, 98601), (299, 72879), (391, 55731), (663, 32867), (897, 24293), (1173, 18577), (1429, 15249), (4287, 5083)]