21900880

素因数分解:

$2^4\times 5^1\times {\mathrm{31}}^1\times {\mathrm{8831}}^1$

素因数の和:8875

約数の個数: 40

約数和(自身を含む): 52568064

約数和(自身を除く): 30667184

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 40, 62, 80, 124, 155, 248, 310, 496, 620, 1240, 2480, 8831, 17662, 35324, 44155, 70648, 88310, 141296, 176620, 273761, 353240, 547522, 706480, 1095044, 1368805, 2190088, 2737610, 4380176, 5475220, 10950440, 21900880]

約数ペア:

[(1, 21900880), (2, 10950440), (4, 5475220), (5, 4380176), (8, 2737610), (10, 2190088), (16, 1368805), (20, 1095044), (31, 706480), (40, 547522), (62, 353240), (80, 273761), (124, 176620), (155, 141296), (248, 88310), (310, 70648), (496, 44155), (620, 35324), (1240, 17662), (2480, 8831)]