20338280

素因数分解:

$2^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{89}}^1\times {\mathrm{197}}^1$

素因数の和:326

約数の個数: 64

約数和(自身を含む): 48114000

約数和(自身を除く): 27775720

約数列:

[1, 2, 4, 5, 8, 10, 20, 29, 40, 58, 89, 116, 145, 178, 197, 232, 290, 356, 394, 445, 580, 712, 788, 890, 985, 1160, 1576, 1780, 1970, 2581, 3560, 3940, 5162, 5713, 7880, 10324, 11426, 12905, 17533, 20648, 22852, 25810, 28565, 35066, 45704, 51620, 57130, 70132, 87665, 103240, 114260, 140264, 175330, 228520, 350660, 508457, 701320, 1016914, 2033828, 2542285, 4067656, 5084570, 10169140, 20338280]

約数ペア:

[(1, 20338280), (2, 10169140), (4, 5084570), (5, 4067656), (8, 2542285), (10, 2033828), (20, 1016914), (29, 701320), (40, 508457), (58, 350660), (89, 228520), (116, 175330), (145, 140264), (178, 114260), (197, 103240), (232, 87665), (290, 70132), (356, 57130), (394, 51620), (445, 45704), (580, 35066), (712, 28565), (788, 25810), (890, 22852), (985, 20648), (1160, 17533), (1576, 12905), (1780, 11426), (1970, 10324), (2581, 7880), (3560, 5713), (3940, 5162)]