20992580

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{691}}^1$

素因数の和:745

約数の個数: 72

約数和(自身を含む): 53012736

約数和(自身を除く): 32020156

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, 691, 868, 980, 1085, 1382, 1519, 2170, 2764, 3038, 3455, 4340, 4837, 6076, 6910, 7595, 9674, 13820, 15190, 19348, 21421, 24185, 30380, 33859, 42842, 48370, 67718, 85684, 96740, 107105, 135436, 149947, 169295, 214210, 299894, 338590, 428420, 599788, 677180, 749735, 1049629, 1499470, 2099258, 2998940, 4198516, 5248145, 10496290, 20992580]

約数ペア:

[(1, 20992580), (2, 10496290), (4, 5248145), (5, 4198516), (7, 2998940), (10, 2099258), (14, 1499470), (20, 1049629), (28, 749735), (31, 677180), (35, 599788), (49, 428420), (62, 338590), (70, 299894), (98, 214210), (124, 169295), (140, 149947), (155, 135436), (196, 107105), (217, 96740), (245, 85684), (310, 67718), (434, 48370), (490, 42842), (620, 33859), (691, 30380), (868, 24185), (980, 21421), (1085, 19348), (1382, 15190), (1519, 13820), (2170, 9674), (2764, 7595), (3038, 6910), (3455, 6076), (4340, 4837)]