18920980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1193}}^1$

素因数の和:1276

約数の個数: 48

約数和(自身を含む): 43528464

約数和(自身を除く): 24607484

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 244, 260, 305, 610, 793, 1193, 1220, 1586, 2386, 3172, 3965, 4772, 5965, 7930, 11930, 15509, 15860, 23860, 31018, 62036, 72773, 77545, 145546, 155090, 291092, 310180, 363865, 727730, 946049, 1455460, 1892098, 3784196, 4730245, 9460490, 18920980]

約数ペア:

[(1, 18920980), (2, 9460490), (4, 4730245), (5, 3784196), (10, 1892098), (13, 1455460), (20, 946049), (26, 727730), (52, 363865), (61, 310180), (65, 291092), (122, 155090), (130, 145546), (244, 77545), (260, 72773), (305, 62036), (610, 31018), (793, 23860), (1193, 15860), (1220, 15509), (1586, 11930), (2386, 7930), (3172, 5965), (3965, 4772)]