18780560

素因数分解:

$2^4\times 5^1\times {\mathrm{181}}^1\times {\mathrm{1297}}^1$

素因数の和:1491

約数の個数: 40

約数和(自身を含む): 43939896

約数和(自身を除く): 25159336

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 181, 362, 724, 905, 1297, 1448, 1810, 2594, 2896, 3620, 5188, 6485, 7240, 10376, 12970, 14480, 20752, 25940, 51880, 103760, 234757, 469514, 939028, 1173785, 1878056, 2347570, 3756112, 4695140, 9390280, 18780560]

約数ペア:

[(1, 18780560), (2, 9390280), (4, 4695140), (5, 3756112), (8, 2347570), (10, 1878056), (16, 1173785), (20, 939028), (40, 469514), (80, 234757), (181, 103760), (362, 51880), (724, 25940), (905, 20752), (1297, 14480), (1448, 12970), (1810, 10376), (2594, 7240), (2896, 6485), (3620, 5188)]