20731720

素因数分解:

$2^3\times 5^1\times {\mathrm{523}}^1\times {\mathrm{991}}^1$

素因数の和:1525

約数の個数: 32

約数和(自身を含む): 46782720

約数和(自身を除く): 26051000

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 523, 991, 1046, 1982, 2092, 2615, 3964, 4184, 4955, 5230, 7928, 9910, 10460, 19820, 20920, 39640, 518293, 1036586, 2073172, 2591465, 4146344, 5182930, 10365860, 20731720]

約数ペア:

[(1, 20731720), (2, 10365860), (4, 5182930), (5, 4146344), (8, 2591465), (10, 2073172), (20, 1036586), (40, 518293), (523, 39640), (991, 20920), (1046, 19820), (1982, 10460), (2092, 9910), (2615, 7928), (3964, 5230), (4184, 4955)]