21554540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{5309}}^1$

素因数の和:5354

約数の個数: 48

約数和(自身を含む): 53524800

約数和(自身を除く): 31970260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 58, 70, 116, 140, 145, 203, 290, 406, 580, 812, 1015, 2030, 4060, 5309, 10618, 21236, 26545, 37163, 53090, 74326, 106180, 148652, 153961, 185815, 307922, 371630, 615844, 743260, 769805, 1077727, 1539610, 2155454, 3079220, 4310908, 5388635, 10777270, 21554540]

約数ペア:

[(1, 21554540), (2, 10777270), (4, 5388635), (5, 4310908), (7, 3079220), (10, 2155454), (14, 1539610), (20, 1077727), (28, 769805), (29, 743260), (35, 615844), (58, 371630), (70, 307922), (116, 185815), (140, 153961), (145, 148652), (203, 106180), (290, 74326), (406, 53090), (580, 37163), (812, 26545), (1015, 21236), (2030, 10618), (4060, 5309)]