19729840

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{311}}^1$

素因数の和:398

約数の個数: 80

約数和(自身を含む): 50371776

約数和(自身を除く): 30641936

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 61, 65, 80, 104, 122, 130, 208, 244, 260, 305, 311, 488, 520, 610, 622, 793, 976, 1040, 1220, 1244, 1555, 1586, 2440, 2488, 3110, 3172, 3965, 4043, 4880, 4976, 6220, 6344, 7930, 8086, 12440, 12688, 15860, 16172, 18971, 20215, 24880, 31720, 32344, 37942, 40430, 63440, 64688, 75884, 80860, 94855, 151768, 161720, 189710, 246623, 303536, 323440, 379420, 493246, 758840, 986492, 1233115, 1517680, 1972984, 2466230, 3945968, 4932460, 9864920, 19729840]

約数ペア:

[(1, 19729840), (2, 9864920), (4, 4932460), (5, 3945968), (8, 2466230), (10, 1972984), (13, 1517680), (16, 1233115), (20, 986492), (26, 758840), (40, 493246), (52, 379420), (61, 323440), (65, 303536), (80, 246623), (104, 189710), (122, 161720), (130, 151768), (208, 94855), (244, 80860), (260, 75884), (305, 64688), (311, 63440), (488, 40430), (520, 37942), (610, 32344), (622, 31720), (793, 24880), (976, 20215), (1040, 18971), (1220, 16172), (1244, 15860), (1555, 12688), (1586, 12440), (2440, 8086), (2488, 7930), (3110, 6344), (3172, 6220), (3965, 4976), (4043, 4880)]