20854420

素因数分解:

$2^2\times 5^1\times {\mathrm{67}}^1\times {\mathrm{79}}^1\times {\mathrm{197}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 45239040

約数和(自身を除く): 24384620

約数列:

[1, 2, 4, 5, 10, 20, 67, 79, 134, 158, 197, 268, 316, 335, 394, 395, 670, 788, 790, 985, 1340, 1580, 1970, 3940, 5293, 10586, 13199, 15563, 21172, 26398, 26465, 31126, 52796, 52930, 62252, 65995, 77815, 105860, 131990, 155630, 263980, 311260, 1042721, 2085442, 4170884, 5213605, 10427210, 20854420]

約数ペア:

[(1, 20854420), (2, 10427210), (4, 5213605), (5, 4170884), (10, 2085442), (20, 1042721), (67, 311260), (79, 263980), (134, 155630), (158, 131990), (197, 105860), (268, 77815), (316, 65995), (335, 62252), (394, 52930), (395, 52796), (670, 31126), (788, 26465), (790, 26398), (985, 21172), (1340, 15563), (1580, 13199), (1970, 10586), (3940, 5293)]