21317780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^2\times {\mathrm{23}}^1\times {\mathrm{383}}^1$

素因数の和:437

約数の個数: 72

約数和(自身を含む): 51480576

約数和(自身を除く): 30162796

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 23, 44, 46, 55, 92, 110, 115, 121, 220, 230, 242, 253, 383, 460, 484, 506, 605, 766, 1012, 1210, 1265, 1532, 1915, 2420, 2530, 2783, 3830, 4213, 5060, 5566, 7660, 8426, 8809, 11132, 13915, 16852, 17618, 21065, 27830, 35236, 42130, 44045, 46343, 55660, 84260, 88090, 92686, 96899, 176180, 185372, 193798, 231715, 387596, 463430, 484495, 926860, 968990, 1065889, 1937980, 2131778, 4263556, 5329445, 10658890, 21317780]

約数ペア:

[(1, 21317780), (2, 10658890), (4, 5329445), (5, 4263556), (10, 2131778), (11, 1937980), (20, 1065889), (22, 968990), (23, 926860), (44, 484495), (46, 463430), (55, 387596), (92, 231715), (110, 193798), (115, 185372), (121, 176180), (220, 96899), (230, 92686), (242, 88090), (253, 84260), (383, 55660), (460, 46343), (484, 44045), (506, 42130), (605, 35236), (766, 27830), (1012, 21065), (1210, 17618), (1265, 16852), (1532, 13915), (1915, 11132), (2420, 8809), (2530, 8426), (2783, 7660), (3830, 5566), (4213, 5060)]