21790215

素因数分解:

$3^4\times 5^1\times {\mathrm{173}}^1\times {\mathrm{311}}^1$

素因数の和:501

約数の個数: 40

約数和(自身を含む): 39413088

約数和(自身を除く): 17622873

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 173, 311, 405, 519, 865, 933, 1555, 1557, 2595, 2799, 4665, 4671, 7785, 8397, 13995, 14013, 23355, 25191, 41985, 53803, 70065, 125955, 161409, 269015, 484227, 807045, 1452681, 2421135, 4358043, 7263405, 21790215]

約数ペア:

[(1, 21790215), (3, 7263405), (5, 4358043), (9, 2421135), (15, 1452681), (27, 807045), (45, 484227), (81, 269015), (135, 161409), (173, 125955), (311, 70065), (405, 53803), (519, 41985), (865, 25191), (933, 23355), (1555, 14013), (1557, 13995), (2595, 8397), (2799, 7785), (4665, 4671)]