21391840

素因数分解:

$2^5\times 5^1\times {\mathrm{23}}^1\times {\mathrm{5813}}^1$

素因数の和:5851

約数の個数: 48

約数和(自身を含む): 52744608

約数和(自身を除く): 31352768

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 32, 40, 46, 80, 92, 115, 160, 184, 230, 368, 460, 736, 920, 1840, 3680, 5813, 11626, 23252, 29065, 46504, 58130, 93008, 116260, 133699, 186016, 232520, 267398, 465040, 534796, 668495, 930080, 1069592, 1336990, 2139184, 2673980, 4278368, 5347960, 10695920, 21391840]

約数ペア:

[(1, 21391840), (2, 10695920), (4, 5347960), (5, 4278368), (8, 2673980), (10, 2139184), (16, 1336990), (20, 1069592), (23, 930080), (32, 668495), (40, 534796), (46, 465040), (80, 267398), (92, 232520), (115, 186016), (160, 133699), (184, 116260), (230, 93008), (368, 58130), (460, 46504), (736, 29065), (920, 23252), (1840, 11626), (3680, 5813)]