21002380

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{739}}^1$

素因数の和:791

約数の個数: 72

約数和(自身を含む): 53146800

約数和(自身を除く): 32144420

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 29, 35, 49, 58, 70, 98, 116, 140, 145, 196, 203, 245, 290, 406, 490, 580, 739, 812, 980, 1015, 1421, 1478, 2030, 2842, 2956, 3695, 4060, 5173, 5684, 7105, 7390, 10346, 14210, 14780, 20692, 21431, 25865, 28420, 36211, 42862, 51730, 72422, 85724, 103460, 107155, 144844, 150017, 181055, 214310, 300034, 362110, 428620, 600068, 724220, 750085, 1050119, 1500170, 2100238, 3000340, 4200476, 5250595, 10501190, 21002380]

約数ペア:

[(1, 21002380), (2, 10501190), (4, 5250595), (5, 4200476), (7, 3000340), (10, 2100238), (14, 1500170), (20, 1050119), (28, 750085), (29, 724220), (35, 600068), (49, 428620), (58, 362110), (70, 300034), (98, 214310), (116, 181055), (140, 150017), (145, 144844), (196, 107155), (203, 103460), (245, 85724), (290, 72422), (406, 51730), (490, 42862), (580, 36211), (739, 28420), (812, 25865), (980, 21431), (1015, 20692), (1421, 14780), (1478, 14210), (2030, 10346), (2842, 7390), (2956, 7105), (3695, 5684), (4060, 5173)]