20210120

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{89}}^1\times {\mathrm{811}}^1$

素因数の和:918

約数の個数: 64

約数和(自身を含む): 52617600

約数和(自身を除く): 32407480

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 89, 140, 178, 280, 356, 445, 623, 712, 811, 890, 1246, 1622, 1780, 2492, 3115, 3244, 3560, 4055, 4984, 5677, 6230, 6488, 8110, 11354, 12460, 16220, 22708, 24920, 28385, 32440, 45416, 56770, 72179, 113540, 144358, 227080, 288716, 360895, 505253, 577432, 721790, 1010506, 1443580, 2021012, 2526265, 2887160, 4042024, 5052530, 10105060, 20210120]

約数ペア:

[(1, 20210120), (2, 10105060), (4, 5052530), (5, 4042024), (7, 2887160), (8, 2526265), (10, 2021012), (14, 1443580), (20, 1010506), (28, 721790), (35, 577432), (40, 505253), (56, 360895), (70, 288716), (89, 227080), (140, 144358), (178, 113540), (280, 72179), (356, 56770), (445, 45416), (623, 32440), (712, 28385), (811, 24920), (890, 22708), (1246, 16220), (1622, 12460), (1780, 11354), (2492, 8110), (3115, 6488), (3244, 6230), (3560, 5677), (4055, 4984)]