19806020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{4481}}^1$

素因数の和:4520

約数の個数: 48

約数和(自身を含む): 47437488

約数和(自身を除く): 27631468

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 52, 65, 68, 85, 130, 170, 221, 260, 340, 442, 884, 1105, 2210, 4420, 4481, 8962, 17924, 22405, 44810, 58253, 76177, 89620, 116506, 152354, 233012, 291265, 304708, 380885, 582530, 761770, 990301, 1165060, 1523540, 1980602, 3961204, 4951505, 9903010, 19806020]

約数ペア:

[(1, 19806020), (2, 9903010), (4, 4951505), (5, 3961204), (10, 1980602), (13, 1523540), (17, 1165060), (20, 990301), (26, 761770), (34, 582530), (52, 380885), (65, 304708), (68, 291265), (85, 233012), (130, 152354), (170, 116506), (221, 89620), (260, 76177), (340, 58253), (442, 44810), (884, 22405), (1105, 17924), (2210, 8962), (4420, 4481)]