21978920

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3371}}^1$

素因数の和:3545

約数の個数: 32

約数和(自身を含む): 49770720

約数和(自身を除く): 27791800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3260, 3371, 6520, 6742, 13484, 16855, 26968, 33710, 67420, 134840, 549473, 1098946, 2197892, 2747365, 4395784, 5494730, 10989460, 21978920]

約数ペア:

[(1, 21978920), (2, 10989460), (4, 5494730), (5, 4395784), (8, 2747365), (10, 2197892), (20, 1098946), (40, 549473), (163, 134840), (326, 67420), (652, 33710), (815, 26968), (1304, 16855), (1630, 13484), (3260, 6742), (3371, 6520)]