21128340

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{397}}^1\times {\mathrm{887}}^1$

素因数の和:1296

約数の個数: 48

約数和(自身を含む): 59375232

約数和(自身を除く): 38246892

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 397, 794, 887, 1191, 1588, 1774, 1985, 2382, 2661, 3548, 3970, 4435, 4764, 5322, 5955, 7940, 8870, 10644, 11910, 13305, 17740, 23820, 26610, 53220, 352139, 704278, 1056417, 1408556, 1760695, 2112834, 3521390, 4225668, 5282085, 7042780, 10564170, 21128340]

約数ペア:

[(1, 21128340), (2, 10564170), (3, 7042780), (4, 5282085), (5, 4225668), (6, 3521390), (10, 2112834), (12, 1760695), (15, 1408556), (20, 1056417), (30, 704278), (60, 352139), (397, 53220), (794, 26610), (887, 23820), (1191, 17740), (1588, 13305), (1774, 11910), (1985, 10644), (2382, 8870), (2661, 7940), (3548, 5955), (3970, 5322), (4435, 4764)]