19887985

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{53}}^1\times {\mathrm{251}}^1$

素因数の和:345

約数の個数: 32

約数和(自身を含む): 27433728

約数和(自身を除く): 7545743

約数列:

[1, 5, 13, 23, 53, 65, 115, 251, 265, 299, 689, 1219, 1255, 1495, 3263, 3445, 5773, 6095, 13303, 15847, 16315, 28865, 66515, 75049, 79235, 172939, 305969, 375245, 864695, 1529845, 3977597, 19887985]

約数ペア:

[(1, 19887985), (5, 3977597), (13, 1529845), (23, 864695), (53, 375245), (65, 305969), (115, 172939), (251, 79235), (265, 75049), (299, 66515), (689, 28865), (1219, 16315), (1255, 15847), (1495, 13303), (3263, 6095), (3445, 5773)]