19999460

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{97}}^1$

素因数の和:193

約数の個数: 72

約数和(自身を含む): 46700136

約数和(自身を除く): 26700676

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 97, 122, 130, 169, 194, 244, 260, 305, 338, 388, 485, 610, 676, 793, 845, 970, 1220, 1261, 1586, 1690, 1940, 2522, 3172, 3380, 3965, 5044, 5917, 6305, 7930, 10309, 11834, 12610, 15860, 16393, 20618, 23668, 25220, 29585, 32786, 41236, 51545, 59170, 65572, 76921, 81965, 103090, 118340, 153842, 163930, 206180, 307684, 327860, 384605, 769210, 999973, 1538420, 1999946, 3999892, 4999865, 9999730, 19999460]

約数ペア:

[(1, 19999460), (2, 9999730), (4, 4999865), (5, 3999892), (10, 1999946), (13, 1538420), (20, 999973), (26, 769210), (52, 384605), (61, 327860), (65, 307684), (97, 206180), (122, 163930), (130, 153842), (169, 118340), (194, 103090), (244, 81965), (260, 76921), (305, 65572), (338, 59170), (388, 51545), (485, 41236), (610, 32786), (676, 29585), (793, 25220), (845, 23668), (970, 20618), (1220, 16393), (1261, 15860), (1586, 12610), (1690, 11834), (1940, 10309), (2522, 7930), (3172, 6305), (3380, 5917), (3965, 5044)]