21178515

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^2\times {\mathrm{157}}^1$

素因数の和:228

約数の個数: 48

約数和(自身を含む): 37745568

約数和(自身を除く): 16567053

約数列:

[1, 3, 5, 15, 17, 23, 51, 69, 85, 115, 157, 255, 345, 391, 471, 529, 785, 1173, 1587, 1955, 2355, 2645, 2669, 3611, 5865, 7935, 8007, 8993, 10833, 13345, 18055, 26979, 40035, 44965, 54165, 61387, 83053, 134895, 184161, 249159, 306935, 415265, 920805, 1245795, 1411901, 4235703, 7059505, 21178515]

約数ペア:

[(1, 21178515), (3, 7059505), (5, 4235703), (15, 1411901), (17, 1245795), (23, 920805), (51, 415265), (69, 306935), (85, 249159), (115, 184161), (157, 134895), (255, 83053), (345, 61387), (391, 54165), (471, 44965), (529, 40035), (785, 26979), (1173, 18055), (1587, 13345), (1955, 10833), (2355, 8993), (2645, 8007), (2669, 7935), (3611, 5865)]