21000201625

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{641}}^1\times {\mathrm{20161}}^1$

素因数の和:20830

約数の個数: 32

約数和(自身を含む): 28269704736

約数和(自身を除く): 7269503111

約数列:

[1, 5, 13, 25, 65, 125, 325, 641, 1625, 3205, 8333, 16025, 20161, 41665, 80125, 100805, 208325, 262093, 504025, 1041625, 1310465, 2520125, 6552325, 12923201, 32761625, 64616005, 168001613, 323080025, 840008065, 1615400125, 4200040325, 21000201625]

約数ペア:

[(1, 21000201625), (5, 4200040325), (13, 1615400125), (25, 840008065), (65, 323080025), (125, 168001613), (325, 64616005), (641, 32761625), (1625, 12923201), (3205, 6552325), (8333, 2520125), (16025, 1310465), (20161, 1041625), (41665, 504025), (80125, 262093), (100805, 208325)]