21789855

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{569}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 40547520

約数和(自身を除く): 18757665

約数列:

[1, 3, 5, 9, 15, 23, 37, 45, 69, 111, 115, 185, 207, 333, 345, 555, 569, 851, 1035, 1665, 1707, 2553, 2845, 4255, 5121, 7659, 8535, 12765, 13087, 21053, 25605, 38295, 39261, 63159, 65435, 105265, 117783, 189477, 196305, 315795, 484219, 588915, 947385, 1452657, 2421095, 4357971, 7263285, 21789855]

約数ペア:

[(1, 21789855), (3, 7263285), (5, 4357971), (9, 2421095), (15, 1452657), (23, 947385), (37, 588915), (45, 484219), (69, 315795), (111, 196305), (115, 189477), (185, 117783), (207, 105265), (333, 65435), (345, 63159), (555, 39261), (569, 38295), (851, 25605), (1035, 21053), (1665, 13087), (1707, 12765), (2553, 8535), (2845, 7659), (4255, 5121)]