21729820

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{269}}^1\times {\mathrm{577}}^1$

素因数の和:862

約数の個数: 48

約数和(自身を含む): 52436160

約数和(自身を除く): 30706340

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 269, 538, 577, 1076, 1154, 1345, 1883, 2308, 2690, 2885, 3766, 4039, 5380, 5770, 7532, 8078, 9415, 11540, 16156, 18830, 20195, 37660, 40390, 80780, 155213, 310426, 620852, 776065, 1086491, 1552130, 2172982, 3104260, 4345964, 5432455, 10864910, 21729820]

約数ペア:

[(1, 21729820), (2, 10864910), (4, 5432455), (5, 4345964), (7, 3104260), (10, 2172982), (14, 1552130), (20, 1086491), (28, 776065), (35, 620852), (70, 310426), (140, 155213), (269, 80780), (538, 40390), (577, 37660), (1076, 20195), (1154, 18830), (1345, 16156), (1883, 11540), (2308, 9415), (2690, 8078), (2885, 7532), (3766, 5770), (4039, 5380)]