21539420

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{709}}^1$

素因数の和:763

約数の個数: 72

約数和(自身を含む): 54391680

約数和(自身を除く): 32852260

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 49, 62, 70, 98, 124, 140, 155, 196, 217, 245, 310, 434, 490, 620, 709, 868, 980, 1085, 1418, 1519, 2170, 2836, 3038, 3545, 4340, 4963, 6076, 7090, 7595, 9926, 14180, 15190, 19852, 21979, 24815, 30380, 34741, 43958, 49630, 69482, 87916, 99260, 109895, 138964, 153853, 173705, 219790, 307706, 347410, 439580, 615412, 694820, 769265, 1076971, 1538530, 2153942, 3077060, 4307884, 5384855, 10769710, 21539420]

約数ペア:

[(1, 21539420), (2, 10769710), (4, 5384855), (5, 4307884), (7, 3077060), (10, 2153942), (14, 1538530), (20, 1076971), (28, 769265), (31, 694820), (35, 615412), (49, 439580), (62, 347410), (70, 307706), (98, 219790), (124, 173705), (140, 153853), (155, 138964), (196, 109895), (217, 99260), (245, 87916), (310, 69482), (434, 49630), (490, 43958), (620, 34741), (709, 30380), (868, 24815), (980, 21979), (1085, 19852), (1418, 15190), (1519, 14180), (2170, 9926), (2836, 7595), (3038, 7090), (3545, 6076), (4340, 4963)]