21383355

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{619}}^1$

素因数の和:688

約数の個数: 48

約数和(自身を含む): 40711680

約数和(自身を除く): 19328325

約数列:

[1, 3, 5, 7, 15, 21, 35, 47, 49, 105, 141, 147, 235, 245, 329, 619, 705, 735, 987, 1645, 1857, 2303, 3095, 4333, 4935, 6909, 9285, 11515, 12999, 21665, 29093, 30331, 34545, 64995, 87279, 90993, 145465, 151655, 203651, 436395, 454965, 610953, 1018255, 1425557, 3054765, 4276671, 7127785, 21383355]

約数ペア:

[(1, 21383355), (3, 7127785), (5, 4276671), (7, 3054765), (15, 1425557), (21, 1018255), (35, 610953), (47, 454965), (49, 436395), (105, 203651), (141, 151655), (147, 145465), (235, 90993), (245, 87279), (329, 64995), (619, 34545), (705, 30331), (735, 29093), (987, 21665), (1645, 12999), (1857, 11515), (2303, 9285), (3095, 6909), (4333, 4935)]