18701990

素因数分解:

$2^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:165

約数の個数: 64

約数和(自身を含む): 37711872

約数和(自身を除く): 19009882

約数列:

[1, 2, 5, 10, 23, 31, 43, 46, 61, 62, 86, 115, 122, 155, 215, 230, 305, 310, 430, 610, 713, 989, 1333, 1403, 1426, 1891, 1978, 2623, 2666, 2806, 3565, 3782, 4945, 5246, 6665, 7015, 7130, 9455, 9890, 13115, 13330, 14030, 18910, 26230, 30659, 43493, 60329, 61318, 81313, 86986, 120658, 153295, 162626, 217465, 301645, 306590, 406565, 434930, 603290, 813130, 1870199, 3740398, 9350995, 18701990]

約数ペア:

[(1, 18701990), (2, 9350995), (5, 3740398), (10, 1870199), (23, 813130), (31, 603290), (43, 434930), (46, 406565), (61, 306590), (62, 301645), (86, 217465), (115, 162626), (122, 153295), (155, 120658), (215, 86986), (230, 81313), (305, 61318), (310, 60329), (430, 43493), (610, 30659), (713, 26230), (989, 18910), (1333, 14030), (1403, 13330), (1426, 13115), (1891, 9890), (1978, 9455), (2623, 7130), (2666, 7015), (2806, 6665), (3565, 5246), (3782, 4945)]