21554455

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{563}}^1$

素因数の和:631

約数の個数: 32

約数和(自身を含む): 30320640

約数和(自身を除く): 8766185

約数列:

[1, 5, 13, 19, 31, 65, 95, 155, 247, 403, 563, 589, 1235, 2015, 2815, 2945, 7319, 7657, 10697, 17453, 36595, 38285, 53485, 87265, 139061, 226889, 331607, 695305, 1134445, 1658035, 4310891, 21554455]

約数ペア:

[(1, 21554455), (5, 4310891), (13, 1658035), (19, 1134445), (31, 695305), (65, 331607), (95, 226889), (155, 139061), (247, 87265), (403, 53485), (563, 38285), (589, 36595), (1235, 17453), (2015, 10697), (2815, 7657), (2945, 7319)]