81876440

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{109}}^1\times {\mathrm{211}}^1$

素因数の和:420

約数の個数: 64

約数和(自身を含む): 188892000

約数和(自身を除く): 107015560

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 109, 178, 211, 218, 356, 422, 436, 445, 545, 712, 844, 872, 890, 1055, 1090, 1688, 1780, 2110, 2180, 3560, 4220, 4360, 8440, 9701, 18779, 19402, 22999, 37558, 38804, 45998, 48505, 75116, 77608, 91996, 93895, 97010, 114995, 150232, 183992, 187790, 194020, 229990, 375580, 388040, 459980, 751160, 919960, 2046911, 4093822, 8187644, 10234555, 16375288, 20469110, 40938220, 81876440]

約数ペア:

[(1, 81876440), (2, 40938220), (4, 20469110), (5, 16375288), (8, 10234555), (10, 8187644), (20, 4093822), (40, 2046911), (89, 919960), (109, 751160), (178, 459980), (211, 388040), (218, 375580), (356, 229990), (422, 194020), (436, 187790), (445, 183992), (545, 150232), (712, 114995), (844, 97010), (872, 93895), (890, 91996), (1055, 77608), (1090, 75116), (1688, 48505), (1780, 45998), (2110, 38804), (2180, 37558), (3560, 22999), (4220, 19402), (4360, 18779), (8440, 9701)]