20980980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{229}}^1\times {\mathrm{509}}^1$

素因数の和:753

約数の個数: 72

約数和(自身を含む): 64045800

約数和(自身を除く): 43064820

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 229, 458, 509, 687, 916, 1018, 1145, 1374, 1527, 2036, 2061, 2290, 2545, 2748, 3054, 3435, 4122, 4580, 4581, 5090, 6108, 6870, 7635, 8244, 9162, 10180, 10305, 13740, 15270, 18324, 20610, 22905, 30540, 41220, 45810, 91620, 116561, 233122, 349683, 466244, 582805, 699366, 1049049, 1165610, 1398732, 1748415, 2098098, 2331220, 3496830, 4196196, 5245245, 6993660, 10490490, 20980980]

約数ペア:

[(1, 20980980), (2, 10490490), (3, 6993660), (4, 5245245), (5, 4196196), (6, 3496830), (9, 2331220), (10, 2098098), (12, 1748415), (15, 1398732), (18, 1165610), (20, 1049049), (30, 699366), (36, 582805), (45, 466244), (60, 349683), (90, 233122), (180, 116561), (229, 91620), (458, 45810), (509, 41220), (687, 30540), (916, 22905), (1018, 20610), (1145, 18324), (1374, 15270), (1527, 13740), (2036, 10305), (2061, 10180), (2290, 9162), (2545, 8244), (2748, 7635), (3054, 6870), (3435, 6108), (4122, 5090), (4580, 4581)]