20985220

素因数分解:

$2^2\times 5^1\times {\mathrm{61}}^1\times {\mathrm{103}}^1\times {\mathrm{167}}^1$

素因数の和:340

約数の個数: 48

約数和(自身を含む): 45497088

約数和(自身を除く): 24511868

約数列:

[1, 2, 4, 5, 10, 20, 61, 103, 122, 167, 206, 244, 305, 334, 412, 515, 610, 668, 835, 1030, 1220, 1670, 2060, 3340, 6283, 10187, 12566, 17201, 20374, 25132, 31415, 34402, 40748, 50935, 62830, 68804, 86005, 101870, 125660, 172010, 203740, 344020, 1049261, 2098522, 4197044, 5246305, 10492610, 20985220]

約数ペア:

[(1, 20985220), (2, 10492610), (4, 5246305), (5, 4197044), (10, 2098522), (20, 1049261), (61, 344020), (103, 203740), (122, 172010), (167, 125660), (206, 101870), (244, 86005), (305, 68804), (334, 62830), (412, 50935), (515, 40748), (610, 34402), (668, 31415), (835, 25132), (1030, 20374), (1220, 17201), (1670, 12566), (2060, 10187), (3340, 6283)]