19985875

素因数分解:

$5^3\times 7^2\times {\mathrm{13}}^1\times {\mathrm{251}}^1$

素因数の和:293

約数の個数: 48

約数和(自身を含む): 31370976

約数和(自身を除く): 11385101

約数列:

[1, 5, 7, 13, 25, 35, 49, 65, 91, 125, 175, 245, 251, 325, 455, 637, 875, 1225, 1255, 1625, 1757, 2275, 3185, 3263, 6125, 6275, 8785, 11375, 12299, 15925, 16315, 22841, 31375, 43925, 61495, 79625, 81575, 114205, 159887, 219625, 307475, 407875, 571025, 799435, 1537375, 2855125, 3997175, 19985875]

約数ペア:

[(1, 19985875), (5, 3997175), (7, 2855125), (13, 1537375), (25, 799435), (35, 571025), (49, 407875), (65, 307475), (91, 219625), (125, 159887), (175, 114205), (245, 81575), (251, 79625), (325, 61495), (455, 43925), (637, 31375), (875, 22841), (1225, 16315), (1255, 15925), (1625, 12299), (1757, 11375), (2275, 8785), (3185, 6275), (3263, 6125)]