20421580

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{881}}^1$

素因数の和:970

約数の個数: 48

約数和(自身を含む): 45934560

約数和(自身を除く): 25512980

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 61, 76, 95, 122, 190, 244, 305, 380, 610, 881, 1159, 1220, 1762, 2318, 3524, 4405, 4636, 5795, 8810, 11590, 16739, 17620, 23180, 33478, 53741, 66956, 83695, 107482, 167390, 214964, 268705, 334780, 537410, 1021079, 1074820, 2042158, 4084316, 5105395, 10210790, 20421580]

約数ペア:

[(1, 20421580), (2, 10210790), (4, 5105395), (5, 4084316), (10, 2042158), (19, 1074820), (20, 1021079), (38, 537410), (61, 334780), (76, 268705), (95, 214964), (122, 167390), (190, 107482), (244, 83695), (305, 66956), (380, 53741), (610, 33478), (881, 23180), (1159, 17620), (1220, 16739), (1762, 11590), (2318, 8810), (3524, 5795), (4405, 4636)]