20811760

素因数分解:

$2^4\times 5^1\times {\mathrm{37}}^1\times {\mathrm{79}}^1\times {\mathrm{89}}^1$

素因数の和:218

約数の個数: 80

約数和(自身を含む): 50889600

約数和(自身を除く): 30077840

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 37, 40, 74, 79, 80, 89, 148, 158, 178, 185, 296, 316, 356, 370, 395, 445, 592, 632, 712, 740, 790, 890, 1264, 1424, 1480, 1580, 1780, 2923, 2960, 3160, 3293, 3560, 5846, 6320, 6586, 7031, 7120, 11692, 13172, 14062, 14615, 16465, 23384, 26344, 28124, 29230, 32930, 35155, 46768, 52688, 56248, 58460, 65860, 70310, 112496, 116920, 131720, 140620, 233840, 260147, 263440, 281240, 520294, 562480, 1040588, 1300735, 2081176, 2601470, 4162352, 5202940, 10405880, 20811760]

約数ペア:

[(1, 20811760), (2, 10405880), (4, 5202940), (5, 4162352), (8, 2601470), (10, 2081176), (16, 1300735), (20, 1040588), (37, 562480), (40, 520294), (74, 281240), (79, 263440), (80, 260147), (89, 233840), (148, 140620), (158, 131720), (178, 116920), (185, 112496), (296, 70310), (316, 65860), (356, 58460), (370, 56248), (395, 52688), (445, 46768), (592, 35155), (632, 32930), (712, 29230), (740, 28124), (790, 26344), (890, 23384), (1264, 16465), (1424, 14615), (1480, 14062), (1580, 13172), (1780, 11692), (2923, 7120), (2960, 7031), (3160, 6586), (3293, 6320), (3560, 5846)]