21387472

素因数分解:

$2^4\times {\mathrm{67}}^1\times {\mathrm{71}}^1\times {\mathrm{281}}^1$

素因数の和:427

約数の個数: 40

約数和(自身を含む): 42800832

約数和(自身を除く): 21413360

約数列:

[1, 2, 4, 8, 16, 67, 71, 134, 142, 268, 281, 284, 536, 562, 568, 1072, 1124, 1136, 2248, 4496, 4757, 9514, 18827, 19028, 19951, 37654, 38056, 39902, 75308, 76112, 79804, 150616, 159608, 301232, 319216, 1336717, 2673434, 5346868, 10693736, 21387472]

約数ペア:

[(1, 21387472), (2, 10693736), (4, 5346868), (8, 2673434), (16, 1336717), (67, 319216), (71, 301232), (134, 159608), (142, 150616), (268, 79804), (281, 76112), (284, 75308), (536, 39902), (562, 38056), (568, 37654), (1072, 19951), (1124, 19028), (1136, 18827), (2248, 9514), (4496, 4757)]