21387440

素因数分解:

$2^4\times 5^1\times {\mathrm{83}}^1\times {\mathrm{3221}}^1$

素因数の和:3317

約数の個数: 40

約数和(自身を含む): 50340528

約数和(自身を除く): 28953088

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 83, 166, 332, 415, 664, 830, 1328, 1660, 3221, 3320, 6442, 6640, 12884, 16105, 25768, 32210, 51536, 64420, 128840, 257680, 267343, 534686, 1069372, 1336715, 2138744, 2673430, 4277488, 5346860, 10693720, 21387440]

約数ペア:

[(1, 21387440), (2, 10693720), (4, 5346860), (5, 4277488), (8, 2673430), (10, 2138744), (16, 1336715), (20, 1069372), (40, 534686), (80, 267343), (83, 257680), (166, 128840), (332, 64420), (415, 51536), (664, 32210), (830, 25768), (1328, 16105), (1660, 12884), (3221, 6640), (3320, 6442)]