21396880

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{15733}}^1$

素因数の和:15763

約数の個数: 40

約数和(自身を含む): 52677432

約数和(自身を除く): 31280552

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 68, 80, 85, 136, 170, 272, 340, 680, 1360, 15733, 31466, 62932, 78665, 125864, 157330, 251728, 267461, 314660, 534922, 629320, 1069844, 1258640, 1337305, 2139688, 2674610, 4279376, 5349220, 10698440, 21396880]

約数ペア:

[(1, 21396880), (2, 10698440), (4, 5349220), (5, 4279376), (8, 2674610), (10, 2139688), (16, 1337305), (17, 1258640), (20, 1069844), (34, 629320), (40, 534922), (68, 314660), (80, 267461), (85, 251728), (136, 157330), (170, 125864), (272, 78665), (340, 62932), (680, 31466), (1360, 15733)]