81747640

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{157207}}^1$

素因数の和:157231

約数の個数: 32

約数和(自身を含む): 198082080

約数和(自身を除く): 116334440

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 157207, 314414, 628828, 786035, 1257656, 1572070, 2043691, 3144140, 4087382, 6288280, 8174764, 10218455, 16349528, 20436910, 40873820, 81747640]

約数ペア:

[(1, 81747640), (2, 40873820), (4, 20436910), (5, 16349528), (8, 10218455), (10, 8174764), (13, 6288280), (20, 4087382), (26, 3144140), (40, 2043691), (52, 1572070), (65, 1257656), (104, 786035), (130, 628828), (260, 314414), (520, 157207)]