21156369

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{101}}^1\times {\mathrm{131}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 31667328

約数和(自身を除く): 10510959

約数列:

[1, 3, 13, 39, 41, 101, 123, 131, 303, 393, 533, 1313, 1599, 1703, 3939, 4141, 5109, 5371, 12423, 13231, 16113, 39693, 53833, 69823, 161499, 172003, 209469, 516009, 542471, 1627413, 7052123, 21156369]

約数ペア:

[(1, 21156369), (3, 7052123), (13, 1627413), (39, 542471), (41, 516009), (101, 209469), (123, 172003), (131, 161499), (303, 69823), (393, 53833), (533, 39693), (1313, 16113), (1599, 13231), (1703, 12423), (3939, 5371), (4141, 5109)]